A PDF File is usually opened with Adobe Acrobat or Adobe Reader. I dont understand why you would have a PDF file for drivers. I looked at the link and it is a PDF. Strange. Maybe it is instructions on what to do, that is all i can think of. I just checked it out it is instructions not the actual drivers. Need to find a .exe for the drivers.
I do not accept support questions via EMail, PM, IM or my G+ page!
Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher