I have a POCO F3 Xiaomi phone not rooted.
Recently when I try to open a PDF file from the WhatsApp, in the list of apps able to open it (Drive, Dropbox PDF viewer, Word, ... are the choices), there is a new app called Open PDF. I never installed it and I can't find it in the settings. So I cannot uninstall it.
I'm worrying. Is it a virus? How to uninstall it?
Note: As @Robert asked in comment, I have a System apps Updater, I think from Xiaomi. This updater appears to modify my default settings and installs apps against my will. Now I am almost sure that this app is from CamScanner.