Adware.MAC.Generic is a detection name that macOS anti-virus products use to describe unidentified applications exhibiting behavior typical for adware. Many macOS users still think their operating system is safe from the various cyber-threats circulating online, but they are living in a false sense of security. MacOS is becoming an attractive target for high-profile malware developers, and there also are tons of harmless applications that can still be major nuisances if they are not stopped on time.
If your anti-virus product reports an Adware.MAC.Generic application, then it is likely that you have experienced the negative effects related to adware. Adware for macOS tends to affect the default user Web browser by showing unwelcome advertisements on sites that may be ad-free otherwise, constantly. It is not uncommon for adware to trigger unexpected redirects to 3rd-party, ad-ridden sites, which users will not enjoy visiting at all.
It is also fundamental not to forget that the advertisements linked to Adware.MAC.Generic may not be trustworthy, and you should avoid them at all costs. If your macOS anti-virus product reports Adware.MAC.Generic, then make sure to confirm its immediate removal, definitely.