The spec for this action:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2111850
An example of a form using this action:
https://www2.illinois.gov/rev/forms/reg/Documents/reg-1-mr.pdf
case "GoToR":
          const urlDict = action.get("F");
          if (isDict(urlDict)) {
            
            
            url = urlDict.get("F") || null;
          } else if (isString(urlDict)) {
            url = urlDict;
          }
          
          let remoteDest = action.get("D");
          if (remoteDest) {
            if (isName(remoteDest)) {
              remoteDest = remoteDest.name;
            }
            if (isString(url)) {
              const baseUrl = url.split("#")[0];
              if (isString(remoteDest)) {
                url = baseUrl + "#" + remoteDest;
              } else if (Array.isArray(remoteDest)) {
                url = baseUrl + "#" + JSON.stringify(remoteDest);
              }
            }
          }
          
          const newWindow = action.get("NewWindow");
          if (isBool(newWindow)) {
            resultObj.newWindow = newWindow;
          }
          break;