PDF and word processer program in one? Scrivener.
The best program for doing what you wish to do, and a million other things beside, is Scrivener:
http://www.literatureandlatte.com/scrivener.php
I have used it for years; indeed, Scrivener is the reason I went over to the Mac, and I'm glad I did! More, from their website:
Your research—always within reach
No more switching between multiple applications to refer to research files: keep all of your background material—images, PDF files, movies, web pages, sound files—right inside Scrivener. And unlike other programs that only let you view one document at a time, in Scrivener you can split the editor to view research in one pane while composing your text right alongside it in another. Need to refer to multiple research documents? Call up additional material in floating QuickReference panes. Transcribe an interview or conversation, make notes on an image or article, or just refer back to another chapter, all without leaving the document you’re working on.