Can verify that the authentic copy is present in /System/Library/Image Capture/Devices/VirtualScanner.app/Contents/Resources on Monterey.
techcoderx@techcoderxs-MacBook-Pro Resources % shasum -a 256 simpledoc.pdf
b1674191a88ec5cdd733e4240a81803105dc412d6c6708d53ab94fc248f4f553 simpledoc.pdf
I wonder how many copies of it are also hidden in other apps, Electrum also has it in ~/.electrum data dir.