This file is indexed.

/etc/mediawiki-extensions/extensions-available/Math.php is in mediawiki-extensions-math 2:1.0+git20120528-8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?php
require_once("$IP/extensions/Math/Math.php");
$wgTexvc = "/usr/bin/texvc";