Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cbdc7155126276…

MALICIOUS

PDF

104.0 KB
MD5: 52b1a3ca20e08671669736a968e27a54 SHA-1: af8b20d8ac853b7c1a6b650cf02704373bb486e3 SHA-256: 51cbdc7155126276d702bf23c015f60bddf6522cd89d63a185e6c1624f47d272
248 Risk Score

Malware Insights

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

The PDF file contains XFA form elements and triggers a critical heap spray exploit. This exploit likely involves executing embedded JavaScript, as indicated by the 'PDF_XFA_SCRIPT' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics. The embedded script is designed to perform a heap spray, a common technique for delivering malicious payloads. The ClamAV detection further confirms the malicious nature of the file, identifying it as 'Pdf.Exploit.Agent-6136306-0'.

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
176d66d665b039bffd9fe9eb222caa7654088b4151f52c400c65865ab61a34c1		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 105775 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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