When you first attempt to open the file using a standard archive manager, it likely fails because the file header is corrupted or incorrect. Use the file command in Linux or a hex editor to inspect the first few bytes. file file_1548317732.rar

You will typically find a nested file, often an image ( .jpg , .png ) or a document. 4. Finding the Flag

file_1548317732.rar (often disguised or missing a proper header) Step-by-Step Solution 1. Initial File Identification

Open the file in a hex editor like or 010 Editor . You will notice that the starting bytes do not match the standard RAR 5.0 signature. Correct RAR 5.0 Signature: 52 61 72 21 1A 07 01 00