Linux, Firefox (view in Firefox): fine
Linux, Firefox, view with evince: fine
Ĺinux, saved file, evince: fine
Looks here we are reporting our own specific problems.
PDF 1.7 is a standard since 2008(!). Also readable by Adobe Reader 8. [Info Wikipedia.] But Hakan's files are PDF 1.7 Extension level 3. Those extensions are Adobe inventions and not a standard; Adobe 9 or higher is needed (also 2008). Level 3 introduces 256-bit AES encryption. For Chrome, DocHub (free in the webstore) can handle this it seems (I don't have Chrome myself, info from chrome.google.com).