PDF – Is the File Safe?

Cyber attackers are increasingly exploiting specific weaknesses in PDF to execute malicious code, disrupt services, or exfiltrate sensitive data. Are you aware of critical vulnerabilities in PDF files? How do conventional cyber defenses intervene? How does Yazam CDR technology intervene?

The PDF (Portable Document Format) standard is a type of file format developed by Adobe Systems. It's used to present documents in a way that is independent of software, hardware, or operating systems.

Stealthy Cyber Threats Within a PDF File

Cyber attackers are increasingly exploiting specific weaknesses in PDF to execute malicious code, disrupt services, or exfiltrate sensitive data.

Are you aware of critical vulnerabilities in PDF files?

Scripts (JavaScript in PDFs)

Malicious JavaScript can execute automatically when the PDF is opened. Attackers can use it to launch drive-by downloads, exploit PDF reader vulnerabilities, automatically open links or prompt fake login dialogs, and trigger heap spray or buffer overflow attacks.

File Attachment

Kinds of embedded files can contain malware or ransomware.

Media Clips (Audio/Video)

Exploits in media codecs or players can be triggered by embedded clips.

Flash Content

Although Flash is deprecated, it remains a security risk due to its ability to exploit Flash Player vulnerabilities.

Hyperlinks

Links can lead to phishing sites, malware downloads, or exploit kits.

External Programs / Launch Actions

Instructions to launch external applications (e.g., cmd.exe, powershell.exe).

Interactive Forms (Acro Forms/XFA)

Can be used to collect sensitive data (such as phishing) or include malicious scripting.

How Do Conventional Cyber Defenses Intervene?

You likely rely on a robust set of classic cyber defense solutions: Firewalls, Antivirus, Antimalware, Secure Email Gateways/Mail Relays, Web proxies, Secure browsers, EDR/XDR, WAF, and Sandboxes.

Mostly, modern attacks in PDF pass through conventional cyber defenses freely.

These tools are essential, but are they truly equipped to handle the unique, structural weaknesses described here? Ask yourself, and your experts:

• Which of them detects all these internal threats, and which internal threats are detected by each one?
• Which of them neutralize all these internal threats, and which internal threats are neutralized by each one?
• Are their detection and neutralization done automatically, speedily, recursively, without human involvement, and on cheap standard hardware?

How Does Yazam CDR Technology Intervene?

Yazam supplies proactive defense against PDF threats.

Yazam Content Disarm and Reconstruction (CDR) technology offers a definitive solution to these sophisticated PDF vulnerabilities. Our engines don't just detect — they proactively neutralize by understanding and rebuilding files from a trusted blueprint:

• Scripts: The Yazam Engine detects scripts and, depending on the customer's policy, either removes them from the PDF file or checks them and approves the use of those that are not found to be malicious.
• External Links: The Yazam Engine detects the URL and, depending on the customer's policy, either removes them from the original PDF file or checks if they are contained in the Yazam malicious URL service. If they appear, the PDF file is blocked; otherwise, it lets the user use the PDF with the link.
• Attachments: The Yazam Engine detects attachments and, depending on the customer's policy, either removes them from the original PDF file or filters them recursively based on their file type and the relevant policy, and then returns them into the filtered PDF.
• Action Launching: The Yazam Engine detects the launching action commands, depending on the customer's policy, either blocks the PDF file or removes the launching action commands from it.
• Flash Content: The Yazam Engine detects flash content and, depending on the customer's policy, either blocks the PDF file or removes the flash content from it.
• Media Clips: The Yazam Engine detects media clips and, depending on the customer's policy, either blocks the PDF file or removes the media clips from it.
• Interactive Forms and Pop-Ups: The Yazam Engine detects the presence of interactive forms and pop-ups, depending on the customer's policy, either blocks the PDF file or removes the interactive forms and pop-ups from it.
• Images: The Yazam Engine detects images and, depending on the customer's policy, either removes them from the original PDF file or filters them recursively based on their file type and the relevant policy, and then returns them into the filtered PDF.

In addition, the Yazam Engine: resets shell properties, removes logical structures, and removes unused objects.

Yazam solutions integrate seamlessly at any critical network locations, providing an essential layer of defense against these often-overlooked yet potent PDF-based threats.