39518.mp4 -

If you have the file and are trying to figure out what it is without opening it, you can:

A very small file (KB) is likely a short clip or meme; a large file (MB/GB) is likely a full video or high-definition recording. 39518.mp4

You can use a tool like VirusTotal to upload the file (or its MD5 hash). This will tell you if the file is known for containing malware or if it has been flagged in other databases. If you have the file and are trying