Mach-O files are usually padded to 4096 byte aligned segments. You can inspect the segments with otool, pagestuff, and nm. NB: UPX compresses it from 23312 ->

Mach-O files are usually padded to 4096 byte aligned segments. You can inspect the segments with otool, pagestuff, and nm. NB: UPX compresses it from 23312 -> 12904 bytes (55.35%) using UCL.