PUP.Optional.Wajam is the detection name for Wajam, a browser add-on marketed as a “social search.”
PUP.Optional.Elex is a detection for a Chines family of potentially unwanted programs (PUPs) that is closely related to adware and even Trojans of the same family. You can find more information about this family in our blog post, Fireball Chinese malware and you.
Malwarebytes can remove this potentially unwanted software without further user interaction. It is advisable to run a full system threat scan, including a scan for rootkits, to see if any other members of this family are present and need to be removed.