Trying to access inaccessible menu item in Acrobat Pro DC

You could also open the menu behind the little Options icon via UI AppleScript.

At least with Acrobat Reader DC this works; I cannot test it with Acrobat Pro DC:

tell application "System Events"
  tell application process "Acrobat Reader"
    tell window 1
      tell group 1
        tell group 1
          tell group 2
            tell group 2
              tell group 1
                tell group 1
                  tell group 2
                    tell menu button 2
                      perform action "Press"
                    end tell
                  end tell
                end tell
              end tell
            end tell
          end tell
        end tell
      end tell
    end tell
  end tell
end tell