I’m Using PDF.JS
I want to make a custom button that add image/s previously stored as base64 on hidden field loaded with the page and add it to pdf viewer by a custom function

EX:

function AddStamp(){
   var base64Data = 'JVBERi0xLjMNCiXi48/TDQoNCjEgMCBvYmoNCj......';
   PDFViewerApplication.pdfViewer.addImage...(base64Data)

}

The PDF viewer have already a button (Add Image) that button opened file input and you have to select a file from your device to show the selected file, but what I need is to use same functionality but with existing image as base64 format.

PDF Viewer Function Example

I’m include the following file

viewer.js
build/pdf.js

I have a look at global class that provided by PDF.JS

There is no clear documentation either

PDFViewerApplication
PDFViewerApplication.pdfDocument
PDFViewerApplication.pdfViewer

but I have no luck no figure it out