If you are getting notifications from PositiveAnalyzer, then your Mac is infected with adware. PositiveAnalyzer is adware for Mac.
PositiveAnalyzer changes setting in your Mac. First, PositiveAnalyzer installs a browser extension in your browser. Then, after PositiveAnalyzer hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.