Malware Notification

When i scan my site with wordfence following error shows :

Filename: wp-content/plugins/autoptimize/config/class-server.php
File Type: Not a core, theme, or plugin file from www.remarpro.com.

Details: This file appears to be installed or modified by a hacker to perform malicious activity. If you know about this file you can choose to ignore it to exclude it from future scans. The matched text in this file is: eval_php_code .= chr(ord

What should i do now?? Should i delete this file or there is any other fixes??

please help urgent..!!!!!!!!!