Ugh -- browsing on a desktop now I clearly see there are two sample PDFs, and:

  host$ sha1 ./Downloads/shattered-*
  SHA1 (./Downloads/shattered-1.pdf) = 38762cf7f55934b34d179ae6a4c80cadccbb7f0a
  SHA1 (./Downloads/shattered-2.pdf) = 38762cf7f55934b34d179ae6a4c80cadccbb7f0a
  host$ md5 ./Downloads/shattered-*
  MD5 (./Downloads/shattered-1.pdf) = ee4aa52b139d925f8d8884402b0a750c
  MD5 (./Downloads/shattered-2.pdf) = 5bd9d8cabc46041579a311230539b8d1
  host$