Appending lead data of inbound leads/Account matching

I recently saw a friends SFDC and saw that their Marketo was able to take inbound leads, match them to an account and therefore populate the lead with the matching account data, ie. company size, location, custom fields. This allowed the Marketo scoring to work on data that didn't automatically come in from the lead form itself but through a quick match to the account and all the data there. The lead record in SFDC also had a custom object with the account data in it. Does anyone know how this is done? Is this a partner tool or is this something that Marketo can do?