Adobe acknowledges some users are vulnerable to attack after downloading an outdated version of Reader. Adobe is now reevaluating how it updates the popular PDF reader. Danish security vendor Secunia says Adobe’s update process can leave users vulnerable for days or even weeks. Adobe has issued two security updates since Reader 9.1’s debut. The first, released May 12, patched a “zero-day” bug in Reader, while the second, issued June 9, fixed 13 or more flaws. According to CA, there are “a vast number of malicious PDF files in circulation on the Internet””]
Source: https://www.csoonline.com/article/2124201/adobe–users-vulnerable-after-downloading-reader.html