--- test.bat ---
@echo OFF
set testurl="http://www.pornhub.com/view_video.php?viewkey=ph572cd1571d594"
for /F "delims=" %%i in ('cscript -Nologo -Job:decode test.wsf %testurl%') do set output=%%i
echo %output%

--- test.wsf ---
<package>
  <job id="decode">
    <script language="JScript">
      var decodedStr = decodeURI(WScript.Arguments(0));
      WScript.Echo(decodedStr.match(/.*/)[0]); //...
    </script>
  </job>
</package>