Thank you for your replies,
I am saving all the files on an external storage and reinstalling everything from scratch. I will wait maybe in the future there will be a solution to access these files.
This is a lesson that i had to learn, the problem is that it was not my fault, someone who accesses our server maybe downloaded unintentionally this file from their mail.
The only thing that would help if i could find out how exactly it got there. As i read on some sites, they don't access the server it has to be a user who clicks that file.
Or is it any other way ?