: Some malware variants use a "zero-second" MP4 file as a small component of a larger attack chain to bypass initial antivirus checks. File Characteristics

: Before opening any downloaded file, upload it to a scanning service like VirusTotal to check for embedded threats. MP4 files explained: How to open and use - Adobe

: This often indicates a duplicate file created during a download process or a numbered sequence in a massive batch of automated uploads on a server or torrent site. Safe Computing Practices

: As defined by Adobe , MP4 (MPEG-4 Part 14) is a digital multimedia container used to store video, audio, and subtitles.