File With Question Marks

In shell (root), I see a file with question marks (?) in all fields:

Code:

?--------- ? ? ? ? ? filename.php

Can't open, edit, remove, rename or anything else with it.

Tried creating a file with the same name and overwriting, but nothing will get it gone.

Doesn't appear to be malicious in any way, just a mystery. Not accesible from the net without password, but directly accessing it gives essentially the same error: not found.

how to remove, and more importantly, how it could have got that way?