Malware Notification Popups

I keep getting the notification '"AdvancedSprintfld21360226397"' will damage your computer. This file was downloaded on an unknown date.' with prompts to click OK or Show in Finder. Regardless which I choose, nothing different happens other than the notification will disappear and another will reappear within seconds. I followed John Galt's super informative post and have brought you my screenshots in hopes you can assist. Many thanks in advance for your knowledge and help.