'Poisoned applications hide themselves by hiding on Google Play and using techniques such as Time Delay or Code Obfuscation (turning variable names, objects . into meaningless characters). At this time, the app is still quite new on the Store and has less than 5,000 downloads. However, there is a concern about the rise of garbage applications, 'Zscaler warned.
El Reg asked Google to comment on this, specifically how the bad guys figured out how to get the malicious code to pass the security control but still didn't get a response. Recent security issues are ringing for Android users to be careful when downloading applications, even on Google Store