Powershell can take a number of commands on a single line. The last command was
-EncodedCommand JABFA....
The single space separates the command for the code that follows. What looks like gibberish is really base 64 code which allows complex constructions in the command line.
Windows can allow a line length of 8192 characters. I am not sure id that is the limitof Powershell. Anyway, it means that the administrator can have a supr command using single line pf Powershell. The base 64 set of characters do not violate any special character restrictions that would otherwise make the command fail. Symbols that would not be allowed are embedded in the base 64 code.
Put another way, this is a neat feature that few of us would every use. If the embedded code had 8000 chars, it could represent over 100 lines of code that do not go over 80 char sin length.
Does that help any?