As reported by several news articles, old Android versions of Camscanner were infected by malware and removed by the Google Play Store. Android Police verified that versions released between June and July 2019 included that malware, newer versions are safe: https://www.androidpolice.com/2019/08/28/camscanner-play-store-malware/ Anyway uninstalling the app and looking for an alternative is suggested
CamScanner turns your phone into a portable scanner. Archive all your paper documents, receipts, notes, whiteboard discussions anywhere and anytime. Camscanner's Smart Image cropping and Image enhancement algorithm ensures the scanned images are perfectly clear and recognizable. Camscanner Free contains ads, Camscanner+ is commercial.