diff --git a/addons/web/static/lib/pdfjs/web/viewer.js b/addons/web/static/lib/pdfjs/web/viewer.js
index 79a9facd7aa..5a5ecf79b99 100644
--- a/addons/web/static/lib/pdfjs/web/viewer.js
+++ b/addons/web/static/lib/pdfjs/web/viewer.js
@@ -13910,7 +13910,8 @@ function getDefaultPreferences() {
       "disablePageLabels": false,
       "enablePrintAutoRotate": false,
       "enableWebGL": false,
-      "eventBusDispatchToDOM": false,
+      // Odoo: This change is needed here as we can't change this parameter in an iframe.
+      "eventBusDispatchToDOM": true, 
       "externalLinkTarget": 0,
       "historyUpdateUrl": false,
       "pdfBugEnabled": false,
diff --git a/addons/web/static/src/js/libs/pdfjs.js b/addons/web/static/src/js/libs/pdfjs.js
new file mode 100644
index 00000000000..92c1e560001
--- /dev/null
+++ b/addons/web/static/src/js/libs/pdfjs.js
@@ -0,0 +1,20 @@
+/*
+* There is no changes to pdf.js in this file, but only a note about a change that has been done in it.
+*
+* In the module account_invoice_extract, the the code need to react to the 'pagerendered' event triggered by
+* pdf.js. However in recent version of pdf.js, event are not visible outside of the library, except if the 
+* 'eventBusDispatchToDOM' has been set to true.
+*
+* We tried to set this option from outside of the library but without success, as our pdf viewer is in an iframe.
+* There is no state of the iframe in which we can add an event listener to set the option.
+* pdf.js has an event used to signal when we can set settings, called 'webviewerloaded'.
+* This event is triggered in an EventListener attached to the 'DOMContentLoaded' event.
+* So, to list options we had, we could:
+* a) add an eventListener to the iframe document or window to react to 'webviewerloaded'. This doesn't work as 
+*    document and windows are not the definitive ones and won't catche the event later.
+* b) add an eventListener to the iframe to react to 'DOMContentLoaded', which doens't work too as our listener will be called
+*    after the pdf.js one.
+*
+* Finally the option was choosed to modify the default value of this option directly in pdf.js as no hook worked in the
+* 'account_invoice_extract' module.
+*/