Unknown files detected in WordPress core:

WordPress 4.5.3
Wordfence 6.1.14
cPanel 11.52.6
Apache 2.2.31
PHP 5.2.17
MySQL 5.5.42
Perl 5.10.1

I noticed in WordFence scans new warnings. With each scan, they show are “new”, even though the same files were marked as “unknown” yesterday:

Unknown file in WordPress core: wp-includes/pomo/thumbs_folder.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/compat3x/pathway.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/directionality/popup.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/hr/pagination.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/image/imagelibrary.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/media/email.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/tabfocus/HMAC.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/wpdialogs/email.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/wpeditimage/users.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/wpgallery/Module.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/wplink/config_session.php
Unknown file in WordPress core: wp-includes/js/tinymce/plugins/wpview/imagelist.php
Unknown file in WordPress core: wp-includes/js/tinymce/skins/lightgray/fonts/mod_menu.php
Unknown file in WordPress core: wp-includes/js/tinymce/skins/lightgray/mod_archive.php
Unknown file in WordPress core: wp-includes/js/jquery/copy.php
Unknown file in WordPress core: wp-includes/js/jquery/ui/LICENSES.php
Unknown file in WordPress core: wp-includes/js/mediaelement/admin.sections.html.php
Unknown file in WordPress core: wp-includes/js/plupload/xml_saxy_parser.php
Unknown file in WordPress core: wp-includes/js/swfupload/edit.php
Unknown file in WordPress core: wp-includes/js/thickbox/editor.php
Unknown file in WordPress core: wp-includes/info.php
Unknown file in WordPress core: wp-includes/certificates/Stat.php
Unknown file in WordPress core: wp-includes/ID3/ru.php
Unknown file in WordPress core: wp-includes/SimplePie/Parse/browser.php
Unknown file in WordPress core: wp-admin/maint/BigMath.php
Unknown file in WordPress core: wp-admin/css/colors/Function.php
Unknown file in WordPress core: wp-admin/css/colors/midnight/midnight.php
Unknown file in WordPress core: wp-admin/css/plugin.php
Unknown file in WordPress core: wp-admin/includes/poll.php

When I tried to look at each of the files, I got something like this:

[ Malware code redacted ]

Have I been hacked?
(the site is https://www.ourpets.com)

https://www.ads-software.com/plugins/wordfence/