Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad154dc0fd2c744…

MALICIOUS

PDF

103.8 KB
MD5: dc76067a2ab9c00e7ad1d1fceabbdb78 SHA-1: 84fc792e2e3c01616b520ba6df277ead497d74e4 SHA-256: cad154dc0fd2c744d98828de025d0e936303a5fa50cca454621af3d6e138c9e4
278 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Heuristic firings indicate a critical PDF_XFA_HEAP_SPRAY, suggesting the presence of exploit code designed to spray the heap. Additionally, PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT indicate that risky executable script content is embedded within the PDF. The ML classifier and ClamAV detection strongly support the malicious nature of this file, identifying it as Pdf.Exploit.Agent. The embedded URLs, while not directly malicious, are related to XFA schema and could be used in conjunction with the exploit.

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
4b6d38907dd3d114d2c8a87ac8f3abcc34b35ec8b98ef15877d0c450958ab515		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 105543 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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