'Identifying compression method in PDF and FlateDecode
Im trying to identify the compression method in a PDF file, and the stream is using FlateDecode -encoding.
However, the data's header does not seem to be a zlib header, or is it ? What compression method is used in the streams data ?
11 0 obj
<<
/Filter
/FlateDecode
/Length 542
>>
stream
0D 0A 9A FC 2C 16 E1 DB
83 80 92 08 82 AD 7A A1
endstream
Solution 1:[1]
/FlateDecode means that there is a zlib stream following the end-of-line characters after stream. What you are showing in hex is not a zlib stream, nor does it contain valid deflate data.
Update:
From the comments, the example file being looked at has encrypted strings and streams. (See Section 7.6 of that very document.)
Sources
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Source: Stack Overflow
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