No it wouldn't. In order to hit anything, the Predator would be in range of the guns of the pirates.
Trying to hit a rapidly moving target at a range of 200 yards or more, using an AK, while sitting in a bobbing and rolling boat, is much harder than you might think. Especially for people who aren't marksmen in the first place
In WW2, navy ships had to pretty much fill the sky with lead to bring down strafing planes