Add images to existing PDF with Preview Preview allows to add text and shapes to PDFs. But is it possible to add existing images (PNG / JPEG) to a PDF file as well?

I do know that Preview already has some of image embedding by allowing the user to add signatures drawn on the screen of an i-Device. But I couldn't figure out if this would also work with arbitrary files.
Do as follows:

Open the image you want to paste in Preview.app
Select All (Command-A)
Copy (Command-C)
Paste (Command-V)

Now you have a copy of your image pasted above your old image. This is apparently meaningless, but the new copy is not just an image, but an object.

Click on the new image (round blue corners appear, no marching ants)
Copy (Command-C)
Paste on your PDF document. The image is an object, moveable and resizable. The original PDF is still a PDF, editable and all.