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This paper presents an analysis of some characteristics from malicious PDFs files. This characteristics where examined on a testbed of 11,104 malicious and 8,668 non malicious files, the malicious samples includes some 0days and files used on the wild for focused attacks. The PDF format is showed very quickly only to help understand the attack vectors. The malicious PDF files attacks are on the wild for almost three years, and recently this kind of attacks are incrementing, and the techniques used to hide from anti-virus software are growing in complex, so this is why is important now to work on understand how this malicious PDF files are formed.