Unpatched AppleHDA.kext from High Sierra 10.13.2

Can someone please share an unpatched AppleHDA.kext from High Sierra 10.13.2 (17C88).

I've tried extracting it from the official update dmg but I get a "corrupt image" everytime. And I can't seem to find it in the "Install macOS High Sierra" dmg.

Thank you very much.