Not valid PDF

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* [JHOVE] includes a PDF module, but it doesn't support PDF 1.7 / ISO 32000 (yet?). In addition its principal author considers JHOVE to be ["approaching the end of its life"|http://fileformats.wordpress.com/2013/10/01/tools/].
* The website of the PDF Association lists [a number of commercially available tools|http://www.pdfa.org/tag/pdfa-validation/] that do validation of either PDF (presumably ISO 32000?) and/or PDF/A.
* [Presentation|http://vimeopro.com/pdfassociation/technical-conference-europe-2013/video/68945979] by Duff Johnson on possibilities of an open source PDF validator that may be developed at some point.


_Apache Preflight_ (part of [Apache PDFBox]) does not validate against the PDF format specification. However, it does include a _Processing error_ category, which is described as "_not necessarily a specific PDF/A validation error but a PDF specification requirement that isn't respected_". Also, if _Preflight_ raises an exception this may also indicate a malformed file.


h2. References

* [Are your documents readable? How would you know?|http://duff-johnson.com/2014/01/24/are-your-documents-readable-how-would-you-know/] - blog post by Duff Johnson, contains link to [presentation|http://vimeopro.com/pdfassociation/technical-conference-europe-2013/video/68945979] on proposal for open source PDF validator that may be developed at some point.