A colleague has asked me for examples of PDF accessibility done right, and I'm drawing a blank.
Links to any publicly available PDF with good semantic structure, tagging, and accessibility to elements like tables and images would be very helpful
although of course you may also use this thread to dunk on the format, if you wish

@ChanceyFleet I don't have any example files, but I did hear recently that Adobe Acrobat has an accessibility checker that is good.* So if you do get examples, you can run them against Acrobat and see what Adobe thinks.

* My license has expired and I'm in no hurry to renew, so I haven't tried it out on any of my own PDFs.