[Python] Extracting .zip in python

I got BadZipfile: Bad magic number for file header error while extracting a .zip using python2 zipfile.ZipFile

Same .zip when extracted with unzip gives file #1: bad zipfile offset (local header sig): 0 but gets extracted with exit code 2.

When using jar -xf file.zip the command completes with $? == 0 with nothing being extracted.

Using file gives:

file -i file.zip
file.zip application/octet-stream; charset=binary


This gives incorrect header for zipfile

$ hexdump -C file.zip | head -10
00000000 50 67 f0 de 1e 7a 29 e4 93 56 3f 11 a2 5f b6 97 |Pg...z)..V?.._..|


Correct header is:

00000000 50 4b 03 04 14 00 08 08 08 00 28 3e 4b 4b 00 00 |PK........(>KK..|


Why is the file listed as application/octet-stream ?

I am on

Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty


Whats going on ? What file format is this ? Any pointers ?

Continue reading...