Individuals have been receiving such emails over the last few days, and with the Christmas upsurge in ordering online, these emails could easily be mistaken as genuine.
The email thanks you for your order, and says the invoice is in the attached zip files. Genuine emails from Amazon give the confirmation in the email text. Apparently, a security check showed the sender was trying to access the address book.
If you receive such an email, delete it immediately and do not open the zip files.