For the popular Foxit PDF Reader, an alternative for Adobes Reader, there is now exploit code available. Many people use Foxit in the hope that it doesn’t contain the same vulnerabilities as the “original” software from Adobe. But a few issues had been found with the alternative PDF Reader as well.
As well as in the Adobe Reader there are security weaknesses within Foxit. Not very common, there is now also exploit code publicly available which can be abused to smuggle malicious code into a victims computer with specially prepared PDF documents. Since there is an update available, make sure to install it immediately!