Without the ability to view the private file directly, I can offer a general analysis of what a video file with this type of naming convention typically represents: Common Sources for This Filename
There is no widely recognized public information or viral context regarding a file named . This specific alphanumeric string appears to be a unique or auto-generated filename, likely used by a digital camera, smartphone, or internal database. Ajb08451 mp4
If this is a file you found or received, you can check its (Windows) or Get Info (Mac) to see the creation date, which might help you remember its origin. Without the ability to view the private file