OK
First, excess air would be vented from the body at both ends. Then you'd asphyxiate. After fifteen seconds or so you would be unconscious, and after about four minutes brain death would start. At this point your body would be completely unruptured and unfrozen. Your body would never rupture: it can survive far bigger pressure drops than 1 bar: deep sea divers get the bends if they surface rapidly, and that involves nitrogen coming out of solution in their blood - but they still don't explode. Eventually, probably after several days, the body would freeze. Space isn't really at 4K: more realistically it doesn't have a temperature as such. But since the heat of your body can only be lost be radiation as convection and conduction can't happen in a vacuum, and since the black-body radiation at 37oC is very poor, it would take an age to freeze. Maybe, just maybe, you'd get a few ice-crystals on the eyes in the first few seconds, but just enough to make them gritty.
If you want to see what happens done realistically, watch 2001.
M