I know all the big attachments are in this directory:
How do I translate that into a specific confluence page?
As (sort-of) described in the document Bruna linked to, the url you want to find the page with the attachment in your example is:
Note that 17892323 is the second-last directory in your path
However a better answer to your wider problem is probably the one at: https://answers.atlassian.com/questions/195387/how-can-i-find-very-large-attachments
You might try to find the PageID related to that attachment by checking the attachments table on Confluence database.
To undesrtand what does this path means:
To retrieve an Attachment from FileSystem:
select s.spaceid,c.contentid,a.attachmentid from spaces s inner join content c on s.spaceid=c.spaceid inner join attachments a on a.pageid=c.contentid;
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