Apparently, the movie is awful, but the poster is fantastically inspired. Again, very much in the vein of Saul Bass posters, and it works very well.
All of the elements explain something about the film. You can tell just from the poster that whoever the guy in the hat is the bad guy, his entire presence on the poster being off-putting and creepy. He is apparently a doctor, making his odd silhouette all the weirder. Finally, the woman indicates some female in the movie will be the target of the bad guy, or perhaps be the one who stands against him.
What's important is that the poster says something. And for that, the creators of the film should be commended.