On OSX, find and rename all pdfs in the current directory to the file's md5sum(.pdf). Added bonus is that it deduplicates.
find ./*.pdf -type f -exec bash -c 'echo "${1%.*}.${1##*.} --> $(md5 -q "$1").${1##*.}"; mv "${1%.*}.${1##*.}" "$(md5 -q "$1").${1##*.}"' bash {} \;
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You could hash over 5 billion things a second over one hundred years before you get a 50% chance of a collision (taking into account the birthday paradox).