When I attach my new iPhone 5s to my Mac, Xcode crashes with this error:
Xcode quit unexpectedly while using the dsc_extractor.bundle plugin
This happens while Xcode is processing symbols from the device.
It all works fine on my iPad4 which is running IOS 6.1.3.
I updated MacOS to Maverick, I reinstalled Xcode and I still have the same error.
My current Xcode version is 5.0.2 (3335.32), iPhone IOS is 7.0.4 (11B554a).
I use a 5S both with a MBPro/Mavericks and regular MB/Snow Leopard; it works fine. Something is messed up on your system, I suspect. Any 3rd party extensions? Try logging out, and logging back in with the shift key down (prevents extensions from loading).