PHP script: malicious JavaScript code at the end

Question

The problem:

On my webspace there are PHP files which all end with this:

Before

Answer 1

I would suggest changing any FTP or SSH passwords to be very secure. If you use a hosting provider you should also notify them of the breach. If you do not have logs to investigate the matter then they may. You should also Google the code that was added to your page to see if you can find anything else.