nerdguy1138 t1_je5ekl5 wrote
Reply to comment by bulbaquil in ELI5: If digital data is stored in 0s & 1s, how does the reader know how many of the digits to take into consideration? by distinct_oversight
The gnu file utility can read the first few bytes of a file as a magic number to determine what kind of file it is.
There is a hacker magazine called POC or GTFO, meaning proof of concept.
The PDFs of that magazine can also be interpreted in various other ways. Files that you can do this with are called polyglots.
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