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The existence of a security flaw in PDF files requires the upgrading of Adobe Reader and Acrobat software. PDFs are usually considered safe to open, and this is apparently the first exception since November 2000, when a hole was found in Adobe's version 4 software.

To eliminate the risk, take one of the following three steps.
(1) Rename Adobe's eBook.api file, if you don't use Adobe eBooks;
(2) Install the Reader 6.0.2 upgrade; or
(3) Upgrade Reader and Acrobat to version 7.0.
We recommend upgrading to Reader 7, just released last month, which is reportedly much faster than Reader 6.

iDefense has posted a description of the problem and workarounds for it:

http://www.idefense.com/application/poi/display?id=163

For the Reader 6.0.2 upgrade or the free Reader 7.0, see:

http://www.adobe.com/products/acrobat/alternate.html