I'd like to direct you to this comment. https://steemit.com/steemliberator/@netuoso/introducing-steem-liberator-preserving-important-files-on-the-steem-blockchain#@sneak/re-someguy123-re-netuoso-introducing-steem-liberator-preserving-important-files-on-the-steem-blockchain-20170721t221945580z

And as I said before, it is easy to ask me to "behave" and be careful, but any attacker that wanted to vest a little SP or use minnowbooster could upload GBs over time. It would only require more storage space and potentially compel larger blocks.

I dont think 2 pdfs would be of concern.