We want to extract our flag from multiple 7zip files, which happen to only contain junk files.

The flag is a PNG whose data is split across these files. An understanding of both file formats is required to extract the right parts from the 7zip files. Binary analysis was done with 010 Editor to identify relevant fields for calculating offsets of PNG data.

Original writeup (https://nevesnunes.github.io/blog/2020/10/06/CTF-Writeup-TastelessCTF-2020-7_12.html).