One of the challenges of incident responders is to identify and classify the malicious files that were used in the attack that compromised the endpoint. The purpose of the attack can be information stealing, installing a backdoor, gaining access to the system, and more. Then once the victim opens the file or interacts with it by clicking on links or buttons, the next stage of the attack is executed. Many attacks start from a received file, usually attached to an email. At the same time, this format is very appealing for cyber criminals, as they can create valid looking documents that will deliver malicious code, or will trick users into clicking links. The flexibility of the PDF format makes these files very useful and widely used by individuals and organizations all over the world. Portable Document Format (PDF) files are cross-platform file format, supporting links, images, and fonts.
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