Hi Teh, This is Ramesh.
The GitHub page explains one of the UAC bypass methods in Windows. They say that the DLL loaded by the built-in scheduled task "CDSSYNC" can be hijacked by modifying the %SystemRoot% environment variable.
By the way, the GitHub page doesn't distribute any DLL or Exe. Instead, it explains how to bypass the UAC. To implement that method, one needs to be an administrator.
The presence of the scheduled task "CDSSYNC" doesn't mean your system is infected. It's a legitimate task present in every system.