There is no FREE PDF viewer on the BB, the 4.5 OS supports basic viewing capabilities, and also the 4.5 OS will have docs to go which if you don't want to upgrade you can download OTA from here http://www.blackberryforums.com/afte...n-tracker.html
I updated OS with latest but it doesnt have pdf viewing capability.
Also documents to go includes only for word and slide show...
I am still looking for free resource for pdf and excel viewer...