When looking for the "top" Buddhist PDFs, you need specific titles. "Buddha Bible" is not a single book; rather, it refers to the Tripiṭaka (Pali Canon) or popular anthologies like The Dhammapada .
If you are looking for a single, bound volume that distills the essence of Buddhism—much like a Bible—several classic compilations are essential starting points. buddha bible pdf top
If you want, I can: