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Thank you for indulging someone who is on the edge of their expertise.
Windows 10 laptop/Firefox.
Your test pdf gave me a stern warning
'This pdf contains forms. The filling of form fields is not supported'Salamander, my choice of pdf readers, seemingly opened the pdf, but gave no warning, but equally no hover-revealed item.
Thanks,
I'll leave this idea for now,
and,
revert to hyperlinked images.
@mespilus No idea and nope. From personal experience I've found Adobe Acrobat Reader flawless (obviously) while macOS preview has a far more relaxed attitude towards showing/hiding hidden objects on mouseover/mouseoff (which would be the method I would use to implement the effect).
Test PDF hopefully attached if you want to try a few readers and see what works.
1 Attachment