PDFspy for Mac

From Apago:

PDFspy is the ultimate "get info" utility for your PDF documents. It can extract a comprehensive list of attributes from a PDF file into an XML-based format. This list can incorporate as little or as much information as you need - whether it's a list of used font, security settings, or color choices.

Some example uses for PDFspy might be:

• Asset management system: extract page count, metadata, font & image information
• Document management: determine text or image only documents, extract comments
• Preflight: extract information about colorspaces, compression & font types
• Validation: find broken PDf files
• Developers: easily examine the structure of complex PDF documents