Last Updated: 2019-08-04 20:07:05 UTC
by Didier Stevens (Version: 1)
By default, command file has no definitions to detect ZLIB detection, but my tool file-magic.py uses an additional file with custom definitions:
Take for example a ZLIB compressed stream in a PDF document:
As you can see, the stream starts with 0x78, an indication that this is ZLIB compression.
Piping this stream in my file-magic.py tool helps identifying the unfiltered stream content:
Of course, if you don't want to use this tool, you can just integrate these ZLIB definitions in your own definition files.