There are lots of jobs advertised out there (through spam or other means) that are just an outright scam.
A good overview of the situation is at CareerBuilder.com. Don’t fall for these “jobs"?. You might end up in jail.
Lured by convenience and seemingly easy money, more and more people are falling prey to job scams. Particularly vulnerable are people who want or need to work from home and those who are looking supplement their income. Those who fall victim can suffer serious consequences including debt collection and criminal charges.
Work-at-home scams are varied and can be more difficult to detect. They come in many different forms and change regularly. To protect yourself, it's important to be aware of the various scams lurking and what to do if you suspect you discover one.