Are you analyzing this for a specific or did you encounter it on a file-sharing site ?

: In many digital forensics challenges, a file with an .rmvb (RealMedia Variable Bitrate) extension is provided to see if the user can find hidden data. Despite the extension, the file might actually be a different format (like a ZIP or a JPEG) or contain a "flag" hidden within its binary strings.

: Use binwalk -e to check if there are other files (like a hidden .txt or .zip ) embedded inside the video container.

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