This will help me give you a much more specific answer.
If you did not initiate this download yourself or do not recognize the source: Download File amf (3).mp4
: Look at your browser history or the message where you found the link to see what the original topic was. This will help me give you a much more specific answer
: Use an antivirus program or an online tool like VirusTotal to check the file before playing it. Download File amf (3).mp4