CVE-2025-14418: 
PDF Architect vulnerability analysis and mitigation

CVE-2025-14418 is a remote code execution vulnerability in pdfforge PDF Architect caused by insufficient UI warnings when processing XLS files. It was discovered by researcher kimiya and reported to the vendor on July 10, 2025. After the vendor failed to provide a patch, ZDI published it as a 0-day advisory on December 11, 2025. The vulnerability affects PDF Architect version 9.1.74.23030 and carries a CVSS v3.0 base score of 7.0 (High) (ZDI Advisory).

The vulnerability is classified as CWE-356 (Product UI Does Not Warn User of Unsafe Actions). When PDF Architect processes a malicious XLS file, it executes embedded dangerous scripts without presenting any warning to the user, bypassing expected security prompts. Exploitation requires the target to open a malicious XLS file or visit a malicious page that triggers the file processing. The flaw was tracked internally as ZDI-CAN-27502 (ZDI Advisory).

Successful exploitation allows an attacker to execute arbitrary code in the context of the currently logged-in user, resulting in high confidentiality, integrity, and availability impact on the affected system. An attacker could read sensitive files, modify data, install malware, or disrupt application availability — all without requiring elevated privileges. The scope is limited to the local user context, but could serve as a foothold for further lateral movement in enterprise environments (ZDI Advisory).

This vulnerability was published as a 0-day advisory on December 11, 2025, meaning no vendor patch was available at the time of disclosure. Exploitation requires user interaction (opening a malicious XLS file or visiting a malicious page), and the attack complexity is rated High due to local attack vector constraints. The EPSS score is approximately 0.066%, indicating a low but non-zero probability of exploitation in the wild. No evidence of active in-the-wild exploitation or CISA KEV catalog listing has been reported as of the available data (ZDI Advisory).

1. Craft malicious XLS file: Create an XLS file embedding dangerous scripts (e.g., macros or embedded objects) that will execute when processed by PDF Architect without triggering a user warning.
2. Deliver the payload: Distribute the malicious XLS file via phishing email, malicious website download, or social engineering, prompting the target to open the file with PDF Architect.
3. Trigger processing: When the victim opens the XLS file in PDF Architect version 9.1.74.23030, the application processes the embedded script without displaying a security warning.
4. Achieve code execution: The embedded script executes in the context of the current user, enabling the attacker to run arbitrary commands, drop additional payloads, or establish persistence (ZDI Advisory).

• File System: Unexpected XLS files in user download directories or temporary folders; new executable files or scripts created in user-writable directories following PDF Architect usage.
• Process: Unusual child processes spawned by the PDF Architect process (e.g., cmd.exe, powershell.exe, wscript.exe, or network utilities like curl or wget).
• Logs: Windows Event Logs showing process creation events with PDF Architect as the parent process for unexpected executables; script interpreter invocations (e.g., VBScript, JScript) originating from PDF Architect.
• Network: Unexpected outbound network connections from the PDF Architect process to external IP addresses, particularly shortly after opening an XLS file (ZDI Advisory).

As of the 0-day disclosure on December 11, 2025, no vendor patch was available. ZDI's recommended mitigation is to restrict interaction with pdfforge PDF Architect until a fix is released. Users should avoid opening untrusted XLS files with PDF Architect, apply network-level controls to limit exposure, and monitor for suspicious process activity. Organizations should check pdfforge's official channels for any subsequent patch releases and prioritize upgrading once a fixed version becomes available (ZDI Advisory).

The vulnerability was disclosed as a 0-day by the Zero Day Initiative after the vendor, pdfforge, failed to provide a patch within the standard coordinated disclosure window despite multiple follow-up attempts over five months. ZDI notified the vendor of its intent to publish on December 5, 2025, and released the advisory on December 11, 2025. No significant public commentary from pdfforge or notable community discussion has been identified beyond standard vulnerability aggregator coverage (ZDI Advisory).