Use binwalk -e [filename] to check if another file (like a hidden ZIP or JPG) is appended to the end of the extracted file.
file_1548317732.rar (often disguised or missing a proper header) Step-by-Step Solution 1. Initial File Identification file_1548317732.rar
You will typically find a nested file, often an image ( .jpg , .png ) or a document. 4. Finding the Flag Use binwalk -e [filename] to check if another