diff --git a/addons/account_edi/models/account_edi_format.py b/addons/account_edi/models/account_edi_format.py
index 93d74840e69..9367b22a0fa 100644
--- a/addons/account_edi/models/account_edi_format.py
+++ b/addons/account_edi/models/account_edi_format.py
@@ -297,8 +297,11 @@ class AccountEdiFormat(models.Model):
             return to_process
 
         # Process embedded files.
-        for xml_name, content in pdf_reader.getAttachments():
-            to_process.extend(self._decode_xml(xml_name, content))
+        try:
+            for xml_name, content in pdf_reader.getAttachments():
+                to_process.extend(self._decode_xml(xml_name, content))
+        except NotImplementedError as e:
+            _logger.warning("Unable to access the attachments of %s. Tried to decrypt it, but %s." % (filename, e))
 
         # Process the pdf itself.
         to_process.append({
diff --git a/odoo/addons/base/tests/test_pdf.py b/odoo/addons/base/tests/test_pdf.py
index 6954ca4a689..6f1368e40d0 100644
--- a/odoo/addons/base/tests/test_pdf.py
+++ b/odoo/addons/base/tests/test_pdf.py
@@ -43,6 +43,25 @@ class TestPdf(TransactionCase):
         attachments = list(self.minimal_pdf_reader.getAttachments())
         self.assertEqual(len(attachments), 2)
 
+    def test_odoo_pdf_file_reader_with_owner_encryption(self):
+        pdf_writer = pdf.OdooPdfFileWriter()
+        pdf_writer.cloneReaderDocumentRoot(self.minimal_pdf_reader)
+
+        pdf_writer.addAttachment('test_attachment.txt', b'My awesome attachment')
+        pdf_writer.addAttachment('another_attachment.txt', b'My awesome OTHER attachment')
+
+        pdf_writer.encrypt("", "foo")
+
+        with io.BytesIO() as writer_buffer:
+            pdf_writer.write(writer_buffer)
+            encrypted_content = writer_buffer.getvalue()
+
+        with io.BytesIO(encrypted_content) as reader_buffer:
+            pdf_reader = pdf.OdooPdfFileReader(reader_buffer)
+            attachments = list(pdf_reader.getAttachments())
+
+        self.assertEqual(len(attachments), 2)
+
     def test_merge_pdf(self):
         self.assertEqual(self.minimal_pdf_reader.getNumPages(), 1)
         page = self.minimal_pdf_reader.getPage(0)
diff --git a/odoo/tools/pdf.py b/odoo/tools/pdf.py
index 66608c4b1ff..6929e2684ab 100644
--- a/odoo/tools/pdf.py
+++ b/odoo/tools/pdf.py
@@ -77,7 +77,14 @@ PdfFileReader.__init__ = lambda self, stream, strict=True, warndest=None, overwr
 class OdooPdfFileReader(PdfFileReader):
     # OVERRIDE of PdfFileReader to add the management of multiple embedded files.
 
+    ''' Returns the files inside the PDF.
+    :raises NotImplementedError: if document is encrypted and uses an unsupported encryption method.
+    '''
     def getAttachments(self):
+        if self.isEncrypted:
+            # If the PDF is owner-encrypted, try to unwrap it by giving it an empty user password.
+            self.decrypt('')
+
         if not self.trailer["/Root"].get("/Names", {}).get("/EmbeddedFiles", {}).get("/Names"):
             return []
         for i in range(0, len(self.trailer["/Root"]["/Names"]["/EmbeddedFiles"]["/Names"]), 2):