Greater
[arg2, arg1] → [stringLess(arg2, arg1)]

Adobe documentation

ActionStringGreater

ActionStringGreater is the exact opposite of ActionStringLess. This action code was added for the same reasons as ActionGreater.

FieldTypeComment
ActionStringGreaterACTIONRECORDHEADERActionCode = 0x68

ActionStringGreater does the following:

  1. Pops arg1 and then arg2 off of the stack.
  2. Compares if arg2 > arg1, using byte-by-byte comparison.
  3. Pushes the return value, a Boolean value, onto the stack.