I heard it was 10+ posts. If you can't post virus scan links even now then just break the links, OR you could upload a text file with the links inside them... Either way is fine.
Remember that no download links to the attachment. If you were also planning on doing that, then just upload it on the site. When you create a thread there should be a button that says "Manage Attachments". A window will popup and there you can add your attachment to your post.