A few days ago, independent security firm Zimperium released details about several major security flaws in the popular AirDroid application. In summary, attackers can easily intercept insecure requests to AirDroid’s servers, as well as push malicious APKs to devices which appear as AirDroid add-on updates (which AirDroid then prompts the user to accept).
[Update: Fix is live] AirDroid Beta 4.0.0.2 fixes major security issues, official rollout expected soon was written by the awesome team at Android Police.