Site Down with 400 error

I am running Wordfence, but something got through. See image. How did this happen? Is there a config that I need? Would the premium version of caught this?

/home1/thebroad/public_html/ssv3_directory.php: SL-PHP-BACKDOOR-GENERIC-dgl.UNOFFICIAL FOUND ———– SCAN SUMMARY ———– Known viruses: 2260612 Engine version: devel-clamav-0.99-beta1-632-g8a582c7 Scanned directories: 23742 Scanned files: 143546 Infected files: 1 Data scanned: 2682.37 MB Data read: 103086.59 MB (ratio 0.03:1) Time: 8031.996 sec (133 m 51 s)

• This topic was modified 6 months, 3 weeks ago by hollywoodonlocation.

The page I need help with: [log in to see the link]