With CAPTCHA and email activation enabled on your forum then it will be a real person signing up to write the spam post.
As most forums have these types of setting nearly all forum spam these days it from real people. In some 3rd world countries you even have sweat shop style workshops of people being paid a few cents each day to go around spamming forums, web forms, blogs, and anything else they can find.
The issue with the formatting is because of the way the post was copied and pasted from an Apple Mac document, which has thrown the page styling out.
The simplest thing to do is delete the post and then suspend the members account as that will prevent them signing up again using the same email address.
The following document gives information on how to protect your forum from spam:-
http://www.webwiz.net/webwizforums/kb/spam_prevention.asp