The Google HTML cache of PDF files is often awful to read. If Google can't come up with a good solution, I would't look further. It's a waste of time.
Furthermore, you apperently don't have the original documents that were used to create the PDFs, otherwise you would have used them to create HTML. You should keep in mind that most PDFs floating around the web contain copyrighted material and that many creators won't approve disassembly of their documents.