Evening, gang.
The Linux eco-system is awash with PDF readers/viewers/editors, etc.....ain't it? So what makes one any better than the others..?
Before I moved to Linux - and Puppy - I used Foxit Software's PDF editor under XP. Since moving to the 'dark side' - 
- I've kept a weather eye on Foxit's Linux build. It's always looked as plain as a pikestaff in comparison with the Windows build, but over time I've come to realise what they've done. They haven't spent a ton of time making it 'pretty', and filling it full of useless 'features'; instead, the development has all gone on under the "hood".
It's not only a viewer, but you can modify comments and edit text, too. Like many modern PDF apps, the almost mandatory 'cloud connectivity' is all present & correct, though I guess I can see the use of this in today's online, ever-connected world. Basically, it "does what it says on the tin".
Good enough..! 
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You can find the Puppy 'portable' build of Foxit PDF Reader at the following link:-
https://mega.nz/folder/PK5AGKSC#XkiY39qUdSf9UC3TqyxRaA
Navigate through and help yourselves to the one you want. There's a 32-bit build, and a 64-bit build. The 64-bit build works in BK's Tahrpup-era Quirky April; the 32-bit build definitely works as far back as Xenialpup 7.5.......possibly further back still. Just haven't checked that far yet. The process involves having to do an initial 'nstall' from a .run file; Nvidia aren't the only ones that use the damn things!
Usual caveats apply:-
Download
Unzip
Place anywhere you like, though preferably outside the 'save'
Click to enter
Click on 'LAUNCH' to fire it up
Scripts give the usual ability to add and/or remove a Menu entry if so desired.
Hope it's useful. Enjoy!
Mike. 
