ScanSafe 56%-80% of 2009 Malware Infections Related to Adobe Acrobat

In a new report released by CISCO's ScanSafe they claim that 2009 started off with 56% of malware infections occurring by way of flaws found in Adobe Acrobat products. This seems to be very high to me, I would think that some of the drive-by browser flash infections are still a larger percentage of this total.