When attempting to open the archive with standard tools like WinRAR or 7-Zip, the file typically appears empty or throws a "header corrupt" error. Using a hex editor (like HxD), you can identify the file signatures. The file starts with the standard RAR 5.0 signature: 52 61 72 21 1A 07 01 00 .
The or File Header flags may be manually edited. fills(pb).rar
The "write-up" for this challenge usually involves identifying that the archive's internal headers have been tampered with to hide the contents. Specifically: When attempting to open the archive with standard