To check for "hidden" files appended to the end of the image or metadata (like GPS coordinates or comments) that might contain the flag.
If you are currently working on this file, here is the standard process used in similar challenges: cats 3.rar
While "cats 3.rar" does not correspond to a single, universally famous challenge, it most likely refers to a multi-stage or forensics task where participants must find a "flag" (a specific string of text) hidden inside an archive. Likely Challenge Workflow To check for "hidden" files appended to the
Knowing the source will help in providing the exact flag or solution steps. Appendix:Australian English military slang - Wiktionary universally famous challenge