It has a nasty Browser Helper Object, called -cdn.rawgit.com Windows PC Affect, that could do the following harm to your system:

  1. Produce junk-e-mails;
  2. Spreads from a malcicious website;
  3. Part of shareware and Freeware;
  4. Could disable Windows Security Tool;
  5. Produces fake warnings and alerts.

That is why Avast alerts there, but https://rawgit.com/ is clean

polonus