Mail is cooking my Mac

Something happend with my MacBook Air after the last update to 10.8.3. Not only mine, my wifes too.
When sending and opening a mail with a pdf attachment, the fans start spinning and Mail is soon up in 100% CPU usage.
Opening the PDF in Preview at the same time forces Previw to also use 100% on the other core.
This never happend before.
The PDF file in this case is a 66k twopage PDF made from Numbers,

Try mailing yourself one of the PDF's linked to this page:
Apple - Support - Manuals

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Csound1 wrote:
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