Check the top-level /Pages dictionary when finding the trailer in XRef.indexObjects
(issue 12402)
#12662
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In addition to the existing /Root and /Pages validation, also check that the /Pages-entry actually is a dictionary and that it has a valid /Count-entry.
This way we can avoid picking a trailer candidate which e.g. the
Catalog.numPages
getter will just end up rejecting, thus breaking PDF document loading completely.Fixes #12402