I recently needed to show a pdf file inside a div in my app. All i wanted was to show it and make it scrollable. The file comes from a fetch() with authorzation headers.
I could not find a way to do this without pdf.js.
This made me try it once more and I got something to work with some Blobs, resource URLs, sanitazion and iframes.
So I guess it is possible
The html object tag can just show a pdf file by default. Just fetch it and pass the source there.
What is the problem with that exactly in your case?
https://www.npmjs.com/package/pdfobject works well as a wrapper around the <object> tag. No mobile support though.