If you found this in a project folder for software like After Effects or Premiere Pro, it is likely a placeholder asset for a specific transition or background effect.
Automated editing apps (like CapCut or various "Save Video" bots) often generate random numeric strings when a user downloads a clip without giving it a custom title. 12485_04_1080p.mp4
(e.g., Is it a nature scene, an interview, or an animation?) Knowing the visual content would make it much easier to trace the original creator or project. If you found this in a project folder