[Phineas Fiske]

The malware detector on my Galaxy S4 (4.4.4) reports a bit of advertising malware (Adware.Mobclick) exists on the phone's external SD card; that's the only place any malware is present on the phone. Using ASTRO file app, I can find the offending file. But I can't remove it: Google (or somebody) doesn't let the phone "write to an external SD card." So, how do I get rid of it? (Or is it harmless where it is??)

[B. Diddy]

Welcome to Android Central! Try a different file manager app like Total Commander or X-Plore. You could also connect to a computer via USB and use Windows Explorer to delete the file. Or unmount the card (in Settings>Storage), remove the card and insert it into the computer, then use Windows Explorer to delete the file.

[Rukbat]

As for it being harmless, it is to the phone. Maybe not to your blood pressure. It's "nagware" or "annoyanceware".