This file is indexed.

/usr/share/horde/nag/index.php is in php-horde-nag 4.2.7-1ubuntu1.

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
/**
 * Nag index script.
 *
 * Copyright 2001-2016 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (GPL). If you
 * did not receive this file, see http://www.horde.org/licenses/gpl.
 */
require_once __DIR__ . '/lib/Application.php';
Horde_Registry::appInit('nag');

switch ($registry->getView()) {
case $registry::VIEW_SMARTMOBILE:
    $url = new Horde_Core_Smartmobile_Url(Horde::url('smartmobile.php'));
    $url->setAnchor('nag-list')->redirect();
    break;

default:
    require __DIR__ . '/list.php';
    break;
}