The Oslo Freedom Forum is an annual event "exploring how best to challenge authoritarianism and promote free and open societies."
This year's conference (which took place May 13-15) had a workshop for freedom of speech activists on how to secure their devices against government monitoring.
During the workshop, Jacob Appelbaum actually discovered a new and previously unknown backdoor on an African activist's Mac.
Our Mac analyst (Brod) is currently investigating the sample.
It's signed with an Apple Developer ID.