QUETTA, Pakistan — A Pakistani truck driver, who rescuers initially thought was dead, was recovering on Tuesday after hospital staff receiving bodies realized he was alive despite being shot five times in one of the most widespread attacks by ethnic militants in years.

On Monday, Munir Ahmed was driving with three colleagues in a convoy of four trucks through the southern province of Balochistan.

The drivers did not notice anything amiss and had not heard of any violence until they were…