1.- It is true that these functions are not functions that can not be misused.
Please read these links.
http://php.net/manual/en/function.eval.php
https://api.jquery.com/jquery.globaleval/
2.- EVAL (GLOBALEVAL) are used scripts:
Index.php, index.php (admin), pulsecore / misc.php, redactor.min.js and jquery.js.
3.- You can check the contents of these scripts.
Example: Edit script index.php. Copy the content between two abostrofs.
<?php eval("?>".base64_decode('
=text=
')."<?");?>
Open Web Page = https://www.base64decode.org/
Decode the content between two abostrofs.
Check the content.
4.- Request a feature (your web site provider)
IvaRo