Export Images: many images skipped

I've got a PDF with about 400 images in it, and I want to export them from Adobe Acrobat Pro X. The problem is that many of the images are skipped, and it isn't just the small ones.

Have a look at this file: http://mercier.org.uk/temp/test.zip

This is the first two pages of the PDF, and the images that were exported. The map on Page 1 didn't get exported.

Any ideas?