Unknown_html_RFI_shell malcode on website!

See: http://jsunpack.jeek.org/?report=03960d7a62c40dbe53996ea1063d94fc25d9ec01
For security researchers only, open with NoScript extension active in a browser within a VM/sandbox.
PHP can be exploited with PHP here: https://bugs.php.net/bug.php?id=35960
via variable php echo e etc. exploit.
Only Bitdefender TrafficLight flags: https://www.virustotal.com/nl/url/b20a46829a82fe673690176ae05d13299420a4fc916183eddae9003bd0e8e30f/analysis/
Nothing detected: http://quttera.com/detailed_report/eldka.grejt.plSystem Details:
Running on: nginx/0.7.67
Outdated Web Server Nginx Found: nginx/0.7.67
Suspicious Javascript Check: Suspicious

///]]>'" For a couple of months it is impossible to verify website:
Suspicious → https://productforums.google.com/forum/#!topic/webmaster-pl/MObGzX4hUqI (po polsku)
& http://www.wordwebmaster.friko.pl/kurs4.html (read with Google translate, because txt is in Polish language)
Technology found: http://interworks.co.uk/resources/data-exploration-tools/dance-js/

polonus