If you’re looking for a good Android PDF reader, look no further. As a Samsung phone owner, I’m familiar with the ThinkFree Office reader, and I’ve found that it just didn’t cut it. MuPDF is a PDF reading app that runs faster than any other I’ve previously used, and it’s free!
As far as features go, MuPDF isn’t heavyset. It scrolls from page to page and offers search and zoom functionality. Other than that, it’s just fast.