How do I embed a PDF as part of a page?

Hi! As stated in the the title, how do I embed a PDF as a part of a page itself?

I’m currently trying to make a script feedback app where a user submits their script as a pdf then the other users can give comments pertaining to certain parts of the pdf and those comments will be displayed in the side. Similar to’s commenting feature.

I tried using other pdf plugins but it can’t integrate the commenting feature that I want.

How can I possibly make this? (I’m a complete beginner in programming)