Can't open PDF files in e-mail attachments.

I'm fairly new to my 8700r, and need to check e-mails when i'm on the road. I get the e-mails fine, but when I need to open a PDF attachment, it usually does not open up. I highlight >Attachment <Open attachment >Full content >View .... When it occasionally does open, it will have the text seperated (and duplicated) then as i scroll down I see a small thumbnail of one of the pictures, then more text(written twice), then more thumbnails, then text, etc.etc.
Do I need a program to view the PDF as 1 complete piece?
Thanks,
Vic