Check the folder path. If it’s in Android/media/com.whatsapp , it's likely a video sent to you in a chat.
Look at the "Date Modified" in your file explorer to see if it matches a specific event or time you were using your camera. 2. Scan for Malware 57d577622a1a7004mp4
MP4s can occasionally be used to deliver "buffer overflow" exploits in outdated media players. 3. Use a Sandbox Player Don't use your default system player if you are suspicious. Check the folder path
: WhatsApp or Telegram often rename media to save space and organize databases. Use a Sandbox Player Don't use your default
: CCTV and Dashcams use timestamps or hex codes to index footage.
Before opening any unknown file, use a tool like VirusTotal . Upload the file to check it against 70+ antivirus engines.
MP4s are compressed, but high-definition files can be large. If the file size is 0KB, it's a "ghost" file and can be safely deleted.