The Books of the Apocrypha would probably have been readily available and widely read. That would include those apocryphal books that are not in the Roman Catholic canon but are in the canon of most of the canonical Eastern Orthodox Churches. How widely circulated, some of the non canonical literature found in the Dead Sea scrolls, is questionable.
Philo of Alexandria was a contemporary of the Apostles, but I doubt that his writings were in wide circulation during his lifetime. Paul might have read him, but I see no evidence of that in Paul's writings.