I've done some rudimentary parsing of PDF's using CAM::PDF's getPageText() method, but I was only able to deal with PDF v1.4 formatted files though (v1.5 and v1.6 I couldn't parse).
I have not done anything similar in Word, but there must be something around that performs a similar extraction function.
Once you've extracted each file, then you'd need to write the comparator function.
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