In many online contexts, a "deep post" associated with a .rar file suggests a few possibilities:
In certain niche communities (such as digital preservation or specific hobbyist groups), these alphanumeric strings are used to catalog unique uploads. VDGYGABK12 rar
It could be a reference code for a specific compressed archive (RAR file) hosted on a deep web forum or a private file-sharing server. In many online contexts, a "deep post" associated with a