Mia, we are encouraging our instructors to do away with PDFs all together. OCR them. Then take that content and turn it into a Canvas Page. We have had some pretty great results from doing that. Yes, you might need to fidget with the content a bit to get it looking how you would like, but it helps greatly with accessibility.
After looking at that PDF of yours, I'm going to be honest with you. You will have to give up a lot of the air of mystery that comes with declassified document photocopies, in order to transmit the information to your students in an equitable manner. The visual artifacts alone are going to cause your score to drop dramatically, since they cause no end of trouble with screen readers.
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