CVE-2025-14403 Overview
CVE-2025-14403 is a remote code execution vulnerability in PDFsam Enhanced that stems from insufficient user interface warnings when processing the PDF Launch action. The flaw, tracked by the Zero Day Initiative as ZDI-CAN-27500, allows attackers to execute arbitrary code in the context of the current user. Exploitation requires the target to visit a malicious page or open a crafted PDF file. The weakness is classified under [CWE-356] (Product UI Does Not Warn User of Unsafe Actions).
Critical Impact
Attackers can run arbitrary commands on a victim's workstation simply by convincing the user to open a malicious PDF, with no security warning shown before script execution.
Affected Products
- PDFsam Enhanced 7.0.76.15222
- PDFsam Enhanced installations processing PDF documents containing Launch actions
- Workstations where users open PDFs from untrusted sources using PDFsam Enhanced
Discovery Timeline
- 2025-12-23 - CVE-2025-14403 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-14403
Vulnerability Analysis
The vulnerability resides in PDFsam Enhanced's handling of the PDF Launch action. The PDF specification permits documents to invoke external applications or scripts through the Launch action type. Secure PDF readers prompt the user with an explicit warning before executing such actions because the action can run arbitrary commands. PDFsam Enhanced fails to display this warning, executing the referenced script without informing the user. An attacker who controls the contents of a PDF can therefore trigger code execution by enticing a target to open the file. The resulting process runs with the privileges of the logged-on user, granting access to files, credentials, and network resources available to that account.
Root Cause
The root cause is a missing security control in the Launch action handler. The application processes embedded launch instructions without surfacing a confirmation dialog or applying allow-list validation. This maps to [CWE-356], where the product does not adequately warn users of unsafe operations triggered by document content.
Attack Vector
Exploitation requires user interaction. An attacker delivers a malicious PDF through email, a download link, or a compromised website. When the victim opens the document in PDFsam Enhanced, the embedded Launch action runs without prompting. The attack chain typically combines social engineering with a benign-looking PDF that conceals the launch payload, executing follow-on malware or living-off-the-land binaries already present on the host.
No public proof-of-concept code is available. Technical details are documented in the Zero Day Initiative Advisory ZDI-25-1091.
Detection Methods for CVE-2025-14403
Indicators of Compromise
- PDF files containing /Launch action dictionaries referencing executables, scripts, or command interpreters such as cmd.exe, powershell.exe, or wscript.exe
- PDFsam Enhanced process (pdfsam.exe or equivalent) spawning unexpected child processes
- Outbound network connections initiated by processes whose parent is PDFsam Enhanced
- Newly created files or scheduled tasks immediately following a PDF open event
Detection Strategies
- Inspect PDF documents at the email and web gateway for /Launch, /JavaScript, or /JS action keywords combined with executable references
- Apply EDR rules that flag PDFsam Enhanced spawning shell interpreters or scripting hosts as suspicious parent-child process relationships
- Hunt historical telemetry for any process tree where PDFsam Enhanced is the ancestor of a non-document process
Monitoring Recommendations
- Forward process creation, file write, and network connection events from endpoints running PDFsam Enhanced into a centralized data lake for correlation
- Track installations of PDFsam Enhanced across the estate and prioritize monitoring on hosts running version 7.0.76.15222
- Alert on Launch action execution attempts logged by host instrumentation or document inspection tooling
How to Mitigate CVE-2025-14403
Immediate Actions Required
- Restrict use of PDFsam Enhanced for opening PDFs from untrusted sources until a vendor patch is applied
- Route inbound PDF attachments through a sandbox or content disarm and reconstruction service that strips Launch actions
- Apply application control policies that prevent PDFsam Enhanced from spawning command interpreters or scripting hosts
Patch Information
At the time of NVD publication on 2025-12-23, no vendor advisory or fixed version is referenced in the CVE record. Monitor the Zero Day Initiative Advisory ZDI-25-1091 and the PDFsam vendor channels for an updated build that addresses the missing user warning on the Launch action.
Workarounds
- Configure the default PDF handler to a reader that prompts before executing Launch actions, reserving PDFsam Enhanced for trusted internal documents only
- Use endpoint application control to block child processes of PDFsam Enhanced such as cmd.exe, powershell.exe, wscript.exe, and cscript.exe
- Educate users to avoid opening unsolicited PDF attachments and to report unexpected prompts or behavior after opening a document
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
