Where is the original file for the default Contacts profile picture located?
The file is located in many, many different car files. Below is one of the car's and one pdf.
/System/Library/PrivateFrameworks/ContactsUICore.framework/Versions/A/Resources/Assets.car
/System/Library/Frameworks/ContactsUI.framework/Versions/A/Resources/silhouette_placeholder.pdf
Inside the car files there are black silhouette pdfs. My guess is that inverts it (to white) and then adds the background.
Heres my attempt at recreating it:
