I can't think of a PDF but there are images like this. "Lenna". There are also really famous datasets that are used for examples in similar ways (iris).
Lenna is copyright-encumbered (despite its widespread use, Apple is a commercial operator and can't do that sort of thing) and it's not very inclusive to use a playboy centerfold image (even cropped) and it's taking some heat on the sexism front these days.
"In today’s age of high-resolution digital image technology, it seems difficult to argue that a 512 × 512 image produced with a 1970s-era analog scanner is the best we have to offer as an image quality test standard".[2]
Careful, there is someone whose name I shall not mention who is suing people claiming he is Satoshi and has copyright over the Whitepaper. He even got it banned from Bitcoin.org in the UK
paulmd|2 years ago
drjasonharrison|2 years ago
https://en.m.wikipedia.org/wiki/Lenna
"In today’s age of high-resolution digital image technology, it seems difficult to argue that a 512 × 512 image produced with a 1970s-era analog scanner is the best we have to offer as an image quality test standard".[2]
kobieyc|2 years ago