diff --git a/app/jobs/anti_virus_job.rb b/app/jobs/anti_virus_job.rb
new file mode 100644
index 000000000..c53a246bc
--- /dev/null
+++ b/app/jobs/anti_virus_job.rb
@@ -0,0 +1,20 @@
+class AntiVirusJob < ApplicationJob
+  include ActiveStorage::Downloading
+
+  attr_reader :blob
+
+  def perform(virus_scan)
+    @blob = ActiveStorage::Blob.find_by(key: virus_scan.blob_key)
+
+    if @blob.present?
+      download_blob_to_tempfile do |file|
+        if ClamavService.safe_file?(file.path)
+          status = "safe"
+        else
+          status = "infected"
+        end
+        virus_scan.update(scanned_at: Time.now, status: status)
+      end
+    end
+  end
+end
diff --git a/app/models/champ.rb b/app/models/champ.rb
index d9c32362a..91b8055c0 100644
--- a/app/models/champ.rb
+++ b/app/models/champ.rb
@@ -3,6 +3,7 @@ class Champ < ApplicationRecord
   belongs_to :type_de_champ, inverse_of: :champ
   has_many :commentaires
   has_one_attached :piece_justificative_file
+  has_one :virus_scan
 
   delegate :libelle, :type_champ, :order_place, :mandatory?, :description, :drop_down_list, to: :type_de_champ
 
diff --git a/app/models/champs/piece_justificative_champ.rb b/app/models/champs/piece_justificative_champ.rb
index 83718ab29..4c4270609 100644
--- a/app/models/champs/piece_justificative_champ.rb
+++ b/app/models/champs/piece_justificative_champ.rb
@@ -1,2 +1,12 @@
 class Champs::PieceJustificativeChamp < Champ
+  after_commit :create_virus_scan
+
+  def create_virus_scan
+    if self.piece_justificative_file&.attachment&.blob.present?
+      VirusScan.where(champ: self).where.not(blob_key: self.piece_justificative_file.blob.key).delete_all
+      VirusScan.find_or_create_by!(champ: self, blob_key: self.piece_justificative_file.blob.key) do |virus_scan|
+        virus_scan.status = "pending"
+      end
+    end
+  end
 end
diff --git a/app/models/virus_scan.rb b/app/models/virus_scan.rb
new file mode 100644
index 000000000..f0a45ca31
--- /dev/null
+++ b/app/models/virus_scan.rb
@@ -0,0 +1,17 @@
+class VirusScan < ApplicationRecord
+  belongs_to :champ
+
+  enum status: {
+    pending: 'pending',
+    safe: 'safe',
+    infected: 'infected',
+  }
+
+  validates :champ_id, uniqueness: { scope: :blob_key }
+
+  after_create :perform_scan
+
+  def perform_scan
+    AntiVirusJob.perform_later(self)
+  end
+end
diff --git a/app/views/dossiers/_infos_dossier.html.haml b/app/views/dossiers/_infos_dossier.html.haml
index a14e46c4b..5da92d8d8 100644
--- a/app/views/dossiers/_infos_dossier.html.haml
+++ b/app/views/dossiers/_infos_dossier.html.haml
@@ -47,9 +47,7 @@
                   - else
                     Pas de dossier associé
                 - elsif champ.type_champ == 'piece_justificative'
-                  - pj = champ.piece_justificative_file
-                  %a{ href: url_for(pj), target: '_blank' }
-                    = pj.filename.to_s
+                  = render partial: "shared/champs/piece_justificative/pj_link", locals: { champ: champ, user_can_upload: true }
                 - elsif champ.type_champ == 'textarea'
                   = simple_format(champ.decorate.value)
                 - else
diff --git a/app/views/new_gestionnaire/dossiers/_champs.html.haml b/app/views/new_gestionnaire/dossiers/_champs.html.haml
index a0e203778..2cdda4cb3 100644
--- a/app/views/new_gestionnaire/dossiers/_champs.html.haml
+++ b/app/views/new_gestionnaire/dossiers/_champs.html.haml
@@ -36,8 +36,7 @@
           %td.rich-text
             - pj = c.piece_justificative_file
             - if pj.attached?
-              %a{ href: url_for(pj), target: '_blank' }
-                = pj.filename.to_s
+              = render partial: "shared/champs/piece_justificative/pj_link", locals: { champ: c, user_can_upload: false }
             - else
               Pièce justificative non fournie
         - when "textarea"
diff --git a/app/views/shared/champs/piece_justificative/_pj_link.html.haml b/app/views/shared/champs/piece_justificative/_pj_link.html.haml
new file mode 100644
index 000000000..d808058a4
--- /dev/null
+++ b/app/views/shared/champs/piece_justificative/_pj_link.html.haml
@@ -0,0 +1,18 @@
+- pj = champ.piece_justificative_file
+- if champ.virus_scan.present?
+  - if champ.virus_scan.safe?
+    = link_to pj.filename.to_s, url_for(pj), target: '_blank'
+  - else
+    = pj.filename.to_s
+    - if champ.virus_scan.pending?
+      (analyse antivirus en cours
+      = link_to "rafraichir", request.path
+      )
+    - elsif champ.virus_scan.infected?
+      - if user_can_upload
+        (virus détecté, merci d'envoyer un autre fichier)
+      - else
+        (virus détecté, le téléchargement de ce fichier est bloqué)
+- else
+  = link_to pj.filename.to_s, url_for(pj), target: '_blank'
+  (ce fichier n'a pas été analysé par notre antivirus, téléchargez-le avec précaution)
diff --git a/app/views/shared/dossiers/editable_champs/_piece_justificative.html.haml b/app/views/shared/dossiers/editable_champs/_piece_justificative.html.haml
index c541ffdda..ce4b05fa3 100644
--- a/app/views/shared/dossiers/editable_champs/_piece_justificative.html.haml
+++ b/app/views/shared/dossiers/editable_champs/_piece_justificative.html.haml
@@ -10,8 +10,7 @@
     id: "champs_#{champ.id}",
     direct_upload: true
 - else
-  %a{ href: url_for(pj), target: '_blank' }
-    = pj.filename.to_s
+  = render partial: "shared/champs/piece_justificative/pj_link", locals: { champ: champ, user_can_upload: true }
   %br
   Modifier :
   = form.file_field :piece_justificative_file,
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 380b51502..5043e3677 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -47,6 +47,7 @@ Rails.application.configure do
   }
 
   config.active_job.queue_adapter = :test
+  config.active_storage.service = :test
 
   # Raises error for missing translations
   # config.action_view.raise_on_missing_translations = true
diff --git a/config/storage.yml b/config/storage.yml
index 2c6762e0d..1f93f7323 100644
--- a/config/storage.yml
+++ b/config/storage.yml
@@ -1,3 +1,7 @@
 local:
   service: Disk
   root: <%= Rails.root.join("storage") %>
+
+test:
+  service: Disk
+  root: <%= Rails.root.join("tmp/storage") %>
diff --git a/db/migrate/20180511124302_create_virus_scans.rb b/db/migrate/20180511124302_create_virus_scans.rb
new file mode 100644
index 000000000..80e8e4380
--- /dev/null
+++ b/db/migrate/20180511124302_create_virus_scans.rb
@@ -0,0 +1,12 @@
+class CreateVirusScans < ActiveRecord::Migration[5.2]
+  def change
+    create_table :virus_scans do |t|
+      t.datetime :scanned_at
+      t.string :status
+      t.references :champ, index: true
+      t.string :blob_key
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index e2471ac7a..1a351cd1d 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -594,6 +594,16 @@ ActiveRecord::Schema.define(version: 2018_06_01_084546) do
     t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
   end
 
+  create_table "virus_scans", force: :cascade do |t|
+    t.datetime "scanned_at"
+    t.string "status"
+    t.bigint "champ_id"
+    t.string "blob_key"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["champ_id"], name: "index_virus_scans_on_champ_id"
+  end
+
   create_table "without_continuation_mails", id: :serial, force: :cascade do |t|
     t.text "body"
     t.string "subject"
diff --git a/lib/tasks/2018_06_04_scan_pjs.rake b/lib/tasks/2018_06_04_scan_pjs.rake
new file mode 100644
index 000000000..3ad0e15dc
--- /dev/null
+++ b/lib/tasks/2018_06_04_scan_pjs.rake
@@ -0,0 +1,7 @@
+namespace :'2018_06_04_scan_pjs' do
+  task scan_all: :environment do
+    Champs::PieceJustificativeChamp.all.each do |pj_champ|
+      pj_champ.create_virus_scan
+    end
+  end
+end
diff --git a/spec/factories/champ.rb b/spec/factories/champ.rb
index 45b2637e6..41553b5b6 100644
--- a/spec/factories/champ.rb
+++ b/spec/factories/champ.rb
@@ -17,5 +17,15 @@ FactoryBot.define do
     trait :dossier_link do
       type_de_champ { create(:type_de_champ_dossier_link) }
     end
+
+    trait :piece_justificative do
+      type_de_champ { create(:type_de_champ_piece_justificative) }
+    end
+
+    trait :with_piece_justificative_file do
+      after(:create) do |champ, evaluator|
+        champ.piece_justificative_file.attach(io: StringIO.new("toto"), filename: "toto.txt", content_type: "text/plain")
+      end
+    end
   end
 end
diff --git a/spec/factories/virus_scan.rb b/spec/factories/virus_scan.rb
new file mode 100644
index 000000000..198f63ee8
--- /dev/null
+++ b/spec/factories/virus_scan.rb
@@ -0,0 +1,4 @@
+FactoryBot.define do
+  factory :virus_scan do
+  end
+end
diff --git a/spec/jobs/anti_virus_job_spec.rb b/spec/jobs/anti_virus_job_spec.rb
new file mode 100644
index 000000000..4c2f1756f
--- /dev/null
+++ b/spec/jobs/anti_virus_job_spec.rb
@@ -0,0 +1,32 @@
+RSpec.describe AntiVirusJob, type: :job do
+  let(:champ) do
+    champ = create(:champ, :piece_justificative)
+    champ.piece_justificative_file.attach(io: StringIO.new("toto"), filename: "toto.txt", content_type: "text/plain")
+    champ
+  end
+  let(:virus_scan) { create(:virus_scan, status: "pending", champ: champ, blob_key: champ.piece_justificative_file.blob.key) }
+
+  subject { AntiVirusJob.new.perform(virus_scan) }
+
+  context "when no virus is found" do
+    let(:virus_found?) { true }
+
+    before do
+      allow(ClamavService).to receive(:safe_file?).and_return(virus_found?)
+      subject
+    end
+
+    it { expect(virus_scan.reload.status).to eq("safe") }
+  end
+
+  context "when a virus is found" do
+    let(:virus_found?) { false }
+
+    before do
+      allow(ClamavService).to receive(:safe_file?).and_return(virus_found?)
+      subject
+    end
+
+    it { expect(virus_scan.reload.status).to eq("infected") }
+  end
+end
diff --git a/spec/models/champ_spec.rb b/spec/models/champ_spec.rb
index 2d7767e9c..dcc51b45a 100644
--- a/spec/models/champ_spec.rb
+++ b/spec/models/champ_spec.rb
@@ -127,4 +127,28 @@ describe Champ do
       it { expect(champ.for_export).to eq('Crétinier, Mousserie') }
     end
   end
+
+  describe '#enqueue_virus_check' do
+    let(:champ) { type_de_champ.champ.build(value: nil) }
+
+    context 'when type_champ is type_de_champ_piece_justificative' do
+      let(:type_de_champ) { create(:type_de_champ_piece_justificative) }
+
+      context 'and there is a blob' do
+        before { champ.piece_justificative_file.attach(io: StringIO.new("toto"), filename: "toto.txt", content_type: "text/plain") }
+
+        it { expect{ champ.save }.to change(VirusScan, :count).by(1) }
+      end
+
+      context 'and there is no blob' do
+        it { expect{ champ.save }.to_not change(VirusScan, :count) }
+      end
+    end
+
+    context 'when type_champ is not type_de_champ_piece_justificative' do
+      let(:type_de_champ) { create(:type_de_champ_textarea) }
+
+      it { expect{ champ.save }.to_not change(VirusScan, :count) }
+    end
+  end
 end