Again, thank you, but unfortunately this doesn't help. The form at that link asks for either a URL or a file, but Avast Mobile Security is reacting to neither. It's claiming that an app installed through the Google Play Store contains malicious code. Mobile Security provides no other details — no indication of the offending file. Since the entry on Google's Play Store for the Weather & Clock Widget for Android app doesn't provide this information either, there is no way to report the false positive using this form.
Is there a way to report this via the app name on Google's Play Store?