Strange headings in release note PDF's

Hello,

The headings in the PDF's of the release notes look strange, e.g. the main titles in
1 - http://www.debian.org/releases/jessie/amd64/release-notes.en.pdf
2 - http://www.debian.org/releases/jessie/amd64/release-notes.de.pdf
3 - http://www.debian.org/releases/jessie/i386/release-notes.en.pdf
read:
1 - QdkdÞrd Mnsdr enq CdahÞm 7 —idrrhd(… 53/ahs OB
2 - Ghmvdhrd ytq CdahÞm/Udqñeedmskhbgtmf Udqrhnm 7 —Idrrhd(
Þte 53/Ahs/OB
3 - QdkdÞrd Mnsdr enq CdahÞm 7 —idrrhd(… 21/ahs OB

I checked this from different systems: it really seems to be a problem of the PDF's, not of the PDF viewer.

Can you please have a look at this?

Thank you and best regards
Uwe