CVE-2024-8825 Overview
CVE-2024-8825 is an out-of-bounds read vulnerability [CWE-125] in PDF-XChange Editor and PDF-Tools that can lead to arbitrary code execution. The flaw resides in the PDF file parsing logic, where insufficient validation of user-supplied data allows a read past the end of an allocated buffer. Attackers can leverage the condition to execute code in the context of the current user process.
Exploitation requires user interaction. A target must open a malicious PDF file or visit a page that delivers one. The issue was reported through the Trend Micro Zero Day Initiative as ZDI-CAN-24263 and disclosed under advisory ZDI-24-1248.
Critical Impact
Successful exploitation grants arbitrary code execution in the context of the current user, enabling malware installation, credential theft, or lateral movement from a single opened PDF.
Affected Products
- PDF-XChange Editor version 10.3.0.386
- PDF-XChange PDF-Tools version 10.3.0.386
- Earlier releases sharing the same PDF parsing component
Discovery Timeline
- 2024-11-22 - CVE-2024-8825 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-8825
Vulnerability Analysis
The vulnerability exists in the PDF parsing routines used by PDF-XChange Editor and PDF-Tools. When the application processes a malformed PDF object, it fails to validate the size or offset of user-controlled data before reading from an allocated buffer. The parser then reads memory outside the intended bounds.
Because the out-of-bounds read affects control data used later during processing, an attacker can shape the malicious PDF so that the leaked or misinterpreted bytes drive execution into attacker-influenced state. This turns a read primitive into a foothold for code execution in the process context of the user running the application.
The vulnerability is classified under CWE-125: Out-of-bounds Read and requires local file interaction rather than a network-facing service.
Root Cause
The root cause is missing validation of length or index fields inside a PDF structure before those values are used to access an in-memory buffer. The parser trusts attacker-supplied metadata embedded in the PDF and issues reads that exceed the allocated region.
Attack Vector
An attacker crafts a malicious PDF and delivers it through email, a download link, or a compromised web page. The victim opens the file in PDF-XChange Editor or PDF-Tools. Parsing the document triggers the out-of-bounds read and the subsequent code execution primitive. No elevated privileges are required from the attacker, but user interaction is mandatory.
Refer to the Zero Day Initiative Advisory ZDI-24-1248 for the vendor coordination details.
Detection Methods for CVE-2024-8825
Indicators of Compromise
- Unexpected child processes spawned by PDFXEdit.exe or PDFXTools.exe, such as cmd.exe, powershell.exe, or rundll32.exe
- PDF files opened from temporary internet locations, email attachment directories, or archives immediately prior to process crashes
- Application error events referencing access violations in PDF-XChange modules
- Outbound network connections initiated by the PDF-XChange process to unknown hosts shortly after document open
Detection Strategies
- Monitor process lineage for PDF-XChange executables spawning script interpreters or shells
- Alert on memory access violations and crashes in PDFXEdit.exe correlated with recently opened documents
- Inspect email and web gateways for PDFs containing malformed object streams or unusual xref structures
Monitoring Recommendations
- Enable command-line and process creation auditing on endpoints running PDF-XChange products
- Forward endpoint telemetry, including image loads and file opens, to a centralized data lake for correlation
- Track version inventory of PDF-XChange Editor and PDF-Tools to identify hosts running 10.3.0.386 or earlier
How to Mitigate CVE-2024-8825
Immediate Actions Required
- Upgrade PDF-XChange Editor and PDF-Tools to a version later than 10.3.0.386 per vendor guidance in ZDI-24-1248
- Restrict opening of PDFs from untrusted sources until patching is complete
- Enforce standard user privileges to limit the blast radius of code execution in the user context
Patch Information
Tracker Software has issued fixed builds of PDF-XChange Editor and PDF-Tools that address the parser validation defect. Administrators should consult the Zero Day Initiative Advisory ZDI-24-1248 and the vendor release notes to identify the exact patched build for their environment, then deploy through standard software update channels.
Workarounds
- Block inbound PDFs at email and web gateways when they originate from untrusted senders or domains
- Configure the operating system to open PDFs in a sandboxed default viewer for users who do not require PDF-XChange features
- Apply application allowlisting to prevent PDF-XChange processes from launching script interpreters or shells
- Disable JavaScript and embedded content in PDF-XChange Editor preferences where feasible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
