AirSharing or all apps of that nature are capable of storing and viewing PDFs plus many other file formats.
I love Annotator, which, unlike some other PDF readers I have tried, can handle anything I throw at it. Even stuff over 10 MB in size! http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=285258831&mt=8
There's loads of apps capable of Reading PDFs. Why not try searching the AppStore for "PDF"? Personally, I use MobileFiles Pro, but I've also tried Air Sharing, OneDisk, Briefcase, Files & Annotator
pdf readers when i didn't get a file transfer app like Air Sharing, I converted PDFs to jpegs and depending on the pdf you can read that or try Files lite which caps at 200 MB. also Textguru will read pdfs and is a good editor for text files Best, tony