I realize that I was not clear when asking my question and making an example. I am not referring to regular PDF documents, but intentionally altered ones made up by the bad guys in order to try and cause problems to some application. I am aware that a PDF document may have more than one /Catalog if it has been revised. So what I was asking about is how to find suspicious objects in a PDF, like e.g. seemingly unused or duplicated ones of certain types (like a double /Catalog when the document has no revisions) .... But may be I am still asking the wrong questions in the wrong place...
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