If you find on your hard drive, it likely originated from one of these scenarios:
Data recovery tools (PhotoRec, Recuva) often name salvaged files based on their cluster number and date of recovery. Hence, could be a video recovered from a formatted SD card, with the date reflecting the recovery day, not the original shooting date. 052015-881.mp4
Files with such specific names are often discussed in the context of data recovery or digital forensics, where "orphaned" files are found without their original folder structure. Conclusion If you find on your hard drive, it