Where did the link come from? If it was a random pop-up or an unsolicited message, it is almost certainly a security risk.
A video file hosted on a platform like Google Drive, Mega, or MediaFire. The number "(484)" usually indicates a file count or a specific version used by a uploader. Girls Forever (484) mp4
If you are trying to find out what is inside the file without opening it: Where did the link come from
As there is no widely known media or public file specifically titled this name likely refers to one of three things: The number "(484)" usually indicates a file count
Files with generic names and specific numbers (like "484") are often used to disguise viruses or "click-wrap" malware.
If you already have the file, you can right-click it and select Properties > Details (on Windows) to see the origin or author, but do not double-click to play it .
If this is a link to a "leaked" or private video, accessing it may violate privacy laws or terms of service.