Both iOS (Files/Notes app) and Android (Google Drive) now have built-in document scanners that don't require third-party downloads.
Check your Play Store or App Store "Subscriptions" tab for anything you didn't personally authorize. CamScanner - PDF Scanner App Hack
The hack didn't target the app's core function; it hid in a third-party advertising library. Both iOS (Files/Notes app) and Android (Google Drive)
While the app’s developer eventually removed the offending code and restored it to the Play Store, the incident serves as a major cautionary tale: even "trusted" tools with millions of downloads can be compromised by third-party advertising SDKs. 🕵️ Lessons from the Leak CamScanner - PDF Scanner App Hack