I just searched for an arbitrary PDF file on the web. I took a snippet of text from it and searched for that snippet in "" in Google. The document was found.
Many PDF files are offered as HTML. Does that not imply that Google can read them?
I think they can. They don't rank as well in my opinion for reasons I don't understand or can explain. Just an opinion there. They do rank though.
I will write pdf file and link to it from one of my sites. Put arbitrary content in it and see what happens as an experiment because it could be useful in the future. Oh and just to get KGUN to be a bit less confrontational in the future -