cron.php runs any number of 'cron' jobs - they are called Scheduled Tasks if run by vBulletin. As stated before, you would need to know what time the job was run in order to figure out which of the Scheduled Tasks it is that is at fault. But, as mentioned above, they are usually small tasks and shouldn't be causing any problem at all if you left them as they were when you first installed vbulletin.
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