The contents look to be standard ELF format, up until the decryption seems to fail.
Originally Posted by CodeKiller
It's not just .pkg file it trys to decrypt, you can pass it anything from the PUP and it works on it. (to a point)
Time to start looking at the source and see what's up with it...
jason:~/Desktop/temp$ ./depkg.x86 dev_flash_008.tar.aa.2009_12_06_065518 dev_flash_008.tar.aa.2009_12_06_065518_decrypted
read 0x9F6272 bytes of pkg
pkg data [AT] 300 with size 9f5f72