Pimentel will be sentenced in September, and faces up to seven years in prison.
In Virginia, the man accused of slashing the buttocks of nine women with a box cutter has pleaded guilty.
Former day laborer Johnny Pimentel admitted his guilt on two counts each of malicious wounding and unlawful wounding. Five other counts were dropped as part of a plea deal.
Pimentel targeted women in their 20's and 30's at malls and shopping centers in Fairfax County with a series of attacks that began in February of 2011 and continued for six months.
He began by distracting his victims, often by knocking clothing over, then cutting their buttocks with a box cutter.
None of his victims suffered serious physical injuries. Pimentel was identified by Fairfax police after they received a tip from the public, but he fled to his native Peru, where he was arrested and extradited for trial.
Pimentel faces up to seven years in prison at sentencing in Sept. 6.