Parse error just appeared
You are using quite older version of CiviCRM, I would recommend you to upgrade CiviCRM to 4.7.31 or 5.2.1 rather fixing core code to handle php7. The newer version does support php7. And also since 4.7.7 there has been many security releases(since you had malicious attack) and includes many fixes.

HTH

Pradeep