Because this is not a standardized "viral" or "official" filename, there is no public summary of its contents. To identify what it is, you might check:
: You can right-click the file and select Properties (Windows) or Get Info (Mac) to see if there is any "Title" or "Author" metadata embedded in the file. aff59e1c7740deb0.mp4
: If you are concerned about safety, you can upload the file to VirusTotal to see if it has been flagged as malicious or if other users have commented on its contents. Because this is not a standardized "viral" or