CVE-2025-14421: 
PDF Architect vulnerability analysis and mitigation

CVE-2025-14421 is an out-of-bounds read information disclosure vulnerability in pdfforge PDF Architect, specifically within its PDF file parsing functionality. It affects PDF Architect version 9.1.74.23030 and was reported to the vendor on August 21, 2025, with coordinated public disclosure on December 11, 2025, as a 0-day advisory by the Zero Day Initiative (ZDI-25-1078). The vulnerability carries a CVSS v3.1 base score of 5.5 (Medium) per NVD, and 3.3 (Low) per ZDI (ZDI Advisory, Feedly).

The vulnerability is classified as CWE-125 (Out-of-bounds Read) and stems from insufficient validation of user-supplied data during PDF file parsing, allowing a read past the end of an allocated object. Exploitation requires local access and user interaction — specifically, the target must open a malicious PDF file or visit a malicious page that triggers the parsing logic. While the direct impact is information disclosure, the ZDI advisory notes that an attacker can chain this vulnerability with others to achieve arbitrary code execution in the context of the current process (ZDI Advisory). The vulnerability was internally tracked as ZDI-CAN-27915 and credited to researcher Mat Powell of Trend Zero Day Initiative.

Successful exploitation results in the disclosure of sensitive information from memory of the affected PDF Architect process, with no direct impact on integrity or availability. The confidentiality impact is limited to the current process context; however, when chained with additional vulnerabilities, an attacker could escalate to arbitrary code execution within that process. The attack vector is local, meaning the attacker must be able to deliver a malicious file to the target system and have the user open it (ZDI Advisory).

The vulnerability was published as a 0-day advisory on December 11, 2025, after the vendor did not respond to multiple follow-up requests from ZDI, meaning no vendor patch was available at the time of disclosure. No public proof-of-concept exploit code, exploit kit integration, or in-the-wild exploitation has been reported. The EPSS score is approximately 0.022% (0.000220), indicating a very low probability of exploitation in the near term. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog (ZDI Advisory, Feedly).

1. Craft malicious PDF: Create a specially crafted PDF file designed to trigger an out-of-bounds read during parsing — specifically by manipulating PDF object structures so that the parser reads beyond the end of an allocated buffer.
2. Deliver the file: Distribute the malicious PDF to the target via email attachment, a malicious web page, or other social engineering means, requiring the user to open the file with pdfforge PDF Architect version 9.1.74.23030.
3. Trigger parsing: When the target opens the file, PDF Architect's parser processes the malformed object, causing a read past the end of an allocated object due to missing input validation.
4. Leak memory contents: The out-of-bounds read exposes memory contents from the process, which may include sensitive data such as pointers, credentials, or other in-memory information useful for bypassing ASLR or other mitigations.
5. Chain with additional exploit: Use the leaked memory information in conjunction with a separate vulnerability (e.g., a write primitive) to achieve arbitrary code execution in the context of the PDF Architect process (ZDI Advisory).

• File System: Presence of unexpected or unsolicited PDF files delivered via email or downloaded from unknown sources; PDF files with unusual or malformed internal object structures.
• Process: PDF Architect process (PDFArchitect.exe) crashing or exhibiting abnormal behavior (e.g., access violations) when opening specific PDF files, which may indicate exploitation attempts.
• Logs: Application crash logs or Windows Event Logs recording faults in the PDF Architect process, particularly memory access violations during PDF parsing operations.

As of the 0-day disclosure date (December 11, 2025), no vendor patch was available; pdfforge did not respond to ZDI's coordinated disclosure attempts. ZDI's recommended mitigation is to restrict interaction with the product — specifically, avoid opening untrusted or unexpected PDF files with PDF Architect. Users should monitor the pdfforge website for updated versions and apply any patches as soon as they become available. As a general precaution, consider using alternative PDF viewers for untrusted files and enabling application sandboxing where possible (ZDI Advisory).

The vulnerability was disclosed by Trend Micro's Zero Day Initiative as a 0-day after the vendor failed to respond to multiple follow-up communications over several months. No notable public researcher commentary, vendor statements, or significant media coverage beyond the ZDI advisory and standard vulnerability database aggregators (VulDB, Vulners, CVEFeed) has been identified (ZDI Advisory).