Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec43d0c760a5f158…

MALICIOUS

PDF

12.8 KB
MD5: ebeae3f367399c86e75aca9129b51ce3 SHA-1: c911f8a29aa15828a23b20f4bfcf10298bdc932c SHA-256: ec43d0c760a5f158e4a5bd035c66f5413df5dabbaabd1e7984ede9911c15e064
228 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1059.007 Command and Scripting Interpreter: JavaScript

The PDF sample contains XFA forms with heap spray exploit code and risky executable scripts, as indicated by critical and high severity heuristic firings. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script likely downloads and executes a second-stage payload, although the exact mechanism is obscured by the XFA structure. The embedded file artifact further supports the delivery of additional malicious content.

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
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
84ed8ee9bc48b8fa251d79ef5254fbc48af77a6c7884c9d695f995378b2538f7		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12321 bytes

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