Are you looking for an attachment custom field type? There are rumors that it is possible to create a plugin to do this or you can add your voice to the votes for Atlassian to add this to JIRA as a feature:
https://jira.atlassian.com/browse/JRA-4925
It's not a custom field, it's a system field. It's global, so you can only have one.
When you're adding fields to a *screen* it will be on the list. Once it's added, you need to make sure your users have the rights to add/update attachments too, or it will be hidden from them (in the permission scheme)
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