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Malware exploiting unpatched holes in software was used in attacks on Google and others in December and previous attack on U.S. companies last summer, expert says.
In response, Adobe releases a new version of both Acrobat and Reader.
Fortunately, the risk to end users is low if system has been patched with Microsoft updates.
Adobe issues patch for Flash player vulnerability as worries over unpatched Adobe Reader hole mount.
Here's what is known and what is not known about the China-related attacks on Google and the other Silicon Valley companies.
QuickTime update credits several researchers.