CamScanner allows Android phone owners to snap a picture of a page of text, turn it into a PDF and even use OCR to turn the document into editable text. Kaspersky researchers say a review of a previous version of the app revealed an advertising library containing a malicious module. That module contained dropper malware called Trojan-Dropper.AndroidOS.Necro.n. That dropper extracts and runs another malicious module from an encrypted file included in the app s resources
Source: https://threatpost.com/malicious-app-tallies-100-million-downloads/147748/