This number is one of many combing Craigslist job postings for numbers to send text messages to. They'll offer a job "posting advert to Craigslist" (a well-known scam job that usually ends up like the advance fee scam, where they send you a massive check to deposit and forward a percentage of to somewhere else, and the check turns out to be a dud and you're on the hook for the whole amount). Block and move on.

offering to post ads on craigslist for 500 a week