Why does the Dock executable not yield any useful strings, unlike other OS X apps?
This is because many OS X binaries are encrypted. They are decrypted in real time by the “Don’t Steal Mac OS X.kext” in your /System/Library/Extensions. I don’t know why Apple does it. The Get Info string of the file:


  The purpose of this Apple software is to protect Apple copyrighted materials from unauthorized copying and use. You may not copy, modify, reverse engineer, publicly display, publicly perform, sublicense, transfer or redistribute this file, in whole or in part.  If you have obtained a copy of this Apple software and do not have a valid license from Apple to use it, please immediately destroy or delete it from your computer.