Malicious pdf sample
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For example, within objects there are streams that can be used to store data of any type of size. The language is very rich and complex which means the same information can be encoded and obfuscated in many ways. One key component is the body which might contains all kinds of content type objects that make parsing attractive for vulnerability researchers and exploit developers. In some circumstances the vulnerability could be exploited without opening the file and just by having a malicious file on the hard drive as described by Didier Stevens.įrom a 100 feet view a PDF file is composed by a header, body, reference table and trailer. The Internet Storm Center Handler Bojan Zdrnja wrote a good summary about one of these shellcodes. This shellcode normally downloads and executes a malicious file from the Internet.
#Malicious pdf sample code#
This might cause the application to corrupt memory on the stack or heap causing it to run arbitrary code known as shellcode. Then, for example, If the user opens a PDF malicious file, it typically executes JavaScript that exploits a vulnerability when Adobe Reader parses the crafted file. By reaching the victim mailbox, this attack vector will leverage social engineering techniques to lure the user to click/open the document. However, a malicious PDF or MS Office document might be very successful passing trough Firewalls, Intrusion Prevention Systems, Anti-spam, Anti-virus and other security controls. Most enterprise networks perimeters are protected and contain several security filters and mechanism that block threats. In regards to malicious PDF files the security industry saw a significant increase of vulnerabilities after the second half of 2008 which might be related to Adobe Systems r elease of the specifications, format structure and functionality of PDF files. In other words, a malicious PDF or MS Office document received via e-mail or opened trough a browser plug-in.
![malicious pdf sample malicious pdf sample](https://didierstevens.files.wordpress.com/2008/10/20081030.png)
![malicious pdf sample malicious pdf sample](https://www.welivesecurity.com/wp-content/uploads/2021/07/Figure-3.-Example-of-a-malicious-PDF-file.png)
Mass mailing or targeted campaigns that use common files to host or exploit code have been and are a very popular vector of attack.