Looked like he caught the ball to me and then reached out with it to try to get it in the end zone. All told, I figure he caught the ball and was down on the 1 yard line. Cowboys probably could have driven into the end zone on the next play and won the game or, they might have been thrown back for a loss and screwed up but in all probability they most likely would have won the game.
If we forget the pass, let's say he was just running and did the exact same thing, he was going down and stuck the ball out to try to get it in the end zone, there would have been no issue. He definitely caught the ball and pulled it down. No question.
http://www.al.com/sports/index.ssf/2015/01/dallas_cowboys_vs_green_bay_pa_9.html If you look at the bottom video and imagine he was just running with the football- no pass involved- definitely reaching out trying to get the ball into the end zone. In my humble opinion.