You don't have to worry with Spam Score. High Spam Score doesn't mean your site is spammy or penalized. It is rather a metrict to sign you if you have to check the content of a website, remove an-appropriate backlinks, etc.. It works by comparing to other site, which is a concern to Google because mostly used by fraudster. Some spammy websites used by fraudster to get a victim, the sign is the content is different from the Title, or pretending like others. Penalized websites because it is harmful : exesive ads, copy paste content from other website, no use/garbage contents or dangerous, duplicate content, get ranking with bad way that make visitors disturbing, giving unvisible string those dangerous to mobile phone. As long as your domain is not penalized, Spam Score is no use. And even if it is penalized, as new owner you can ask Google to lift the penalize, by proofing you are a new owner, has been improved and not using the website for harmful activity.
This is definition of Spam Score by Moz :
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