Currently Confluence does not offer options to customise the PDF when exporting. However, we do have a improvement request for this feature: https://jira.atlassian.com/browse/CONF-16527
You might want to vote on it to increase its popularity, as well as add it to your watch-list for future updates.
Also, I see that other customers have found a workaround for this, which they commented on the Feature Request I've mentioned. You might be interested in taking a look at the comments as well.
I hope it helps!
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