Forum Moderators: coopster
First off, anything that shows up unexpectedly needs to be scrutinized immediately for security purposes. And, more importantly, you need to view the contents of that file to see what purpose it serves! If it is merely a one-line file with a phpinfo() command that it is/was being used to see your server configuration. Are you certain your host didn't drop it out there to check something and then forget to remove it? Have you logged in to see the file's timestamp as well as owner/group permissions?
If so, read up here: [blog.phpdoc.info...]
There's a little info on the phpinfo() vulnerabillity here as well: [hardened-php.net...]