The text you provided appears to be a specific typically found on file-sharing or torrent indexing sites.
: You miss out on years of security patches and bug fixes provided by the official developers. Ezpdf reader v1.4.2.1 androidh33tmad dog
: This is the "release tag" or the handle of the specific individual/group who cracked, packaged, or uploaded this particular version of the app. The text you provided appears to be a
: This refers to a well-known (now defunct) torrent tracker and community where files were shared. Ezpdf reader v1.4.2.1 androidh33tmad dog
: This indicates the specific version of the software application.