A score of 1%-30% is considered a Low Spam Score. A score of 31%-60% is considered a Medium Spam Score. A score of 61%-100% is considered click test a High Spam Score. A high Spam Score for your site, or a site you're looking at, doesn't mean this site is necessarily spammy.
When Moz analyzes your site, they look for a wide range of attributes, including those 27 spam signals. The more of these attributes your site has, the higher your spam score will be. You can access your spam score in Moz's Link Explorer, where it will show a percentage from 1 to 100.