Hi, The issue exists with all PDF-files that I have tried.
I tried both commands, and the result is the same for both. So working previous the security update. identify bug.pdf Identify -ping bug.pdf 8:6.8.9.9-5+deb8u4: identify: unable to read image data `/tmp/magick-4028M_5kB2MxtwSv1' @ error/pnm.c/ReadPNMImage/617. 8:6.8.9.9-5+deb8u3: bug.pdf[0] PBM 612x792 612x792+0+0 16-bit Bilevel Gray 61KB 0.000u 0:00.000 bug.pdf[1] PBM 612x792 612x792+0+0 16-bit Bilevel Gray 61KB 0.000u 0:00.079