Microsoft's latest update for Office 2004 for Mac, Microsoft Office 2004 11.5.7, addresses a handful of significant security vulnerabilities surrounding specially crafted Office files that could enable an attacker to view, change, or delete data by executing remote code. The update addresses those issues by altering the way files are opened and parsed. It is rated Important for Microsoft Office 2004 for Mac and requires that you've previously installed the Microsoft Office 2004 for Mac 11.5.6 Update. The update is available from Microsoft's Web site and via the Office 2004 version of Microsoft AutoUpdate. (Free, 9.4 MB)
Track Changes Dates Reset on Save As in Word 2008
If you regularly use the Save As feature to create new drafts while working in Word 2008, you might notice that with Track Changes enabled, previously time-stamped comments and edits have their times reset to the Save As date and time. Work around this by sticking with your original file, but using Save As (or just File > Duplicate in the Finder) to make backup copies.
Microsoft Office 2004 11.5.7
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Realistically, your exposure is pretty low, so I wouldn't stress about this too much, and would recommend just being a little more cautious about opening files from dubious sources.