Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c0dd6186a6bc73…

MALICIOUS

PDF

104.0 KB
MD5: 9a427b4f8ad9fa5bd1b80c1c51408e35 SHA-1: 4d0a909e60c773144160cf60c86ca662e9d051a0 SHA-256: f2c0dd6186a6bc73fd582407a829c9c52fa6b1ab9905602ada38688466ffab0d
278 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The critical heuristic firings for PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT indicate that the XFA form contains executable script designed to exploit this vulnerability. The ML classifier and ClamAV detections further confirm its malicious nature. The embedded script likely downloads and executes a second-stage payload, although the exact nature of the payload is not discernible from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000023d.bin
ff40574cdf3c39c8499790c39d8fd92cf810adf7e57f0d791d1a257b07353ce2		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 105777 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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