I've seen this photo before. It's a great shot, but i don't think the perspective is correct. If you look at shots of the earth and moon from space, the earth could not be that size taken behind the moon. I assume the shot shows a zoom lens perspective or something like that taken from the craft.
I was thinking that it was just closer to the moon than to the earth, which could bring forth such a result.
The L1 Lagrange point orbit of DISCOVR, some 1.5 million kilometers from Earth, provides just such a perspective.
[en.wikipedia.org]