This module uses John the Ripper to attempt to crack Postgres password hashes, gathered by the postgres_hashdump module. It is slower than some of the other JtR modules because it has to do some wordlist manipulation to properly handle postgres' format.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.
– Jim O’Gorman | President, Offensive Security