This module will inject a payload into memory of a process. If a payload isn't selected, then it'll default to a reverse x86 TCP meterpreter. If the PID datastore option isn't specified, then it'll inject into notepad.exe instead.
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