They could take the power adapter, open it up, and install a small computer inside it that is powered off the adapter. That computer could wait for you to plug your phone in while unlocked, copy the files off your phone through USB, and transmit the data over WiFi or cellular data, all while transmitting power back up to your phone so it would behave like a regular charger. In such case they could essentially gain excess to your Crypto exchange passwords, it it is another reason to not store all your crypto on exchanges. Such events noted to occur as of recent.
Image: Independent co, uk.
