Malicious PDF — malware analysis report

Static analysis result for SHA-256 0376e40539564369…

MALICIOUS

PDF

18.4 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 6cdbac67736aa749c9af75a5bbfec076 SHA-1: fa33b7e640295128b23e9e5ebce4c6e6ac5be322 SHA-256: 0376e40539564369fbcf4835dc35bb514d17c2185d1c21e04b6fd246ae5ef1a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-81, and ML classifiers also indicated a high probability of maliciousness. The presence of XFA forms with executable scripts (PDF_XFA_SCRIPT) suggests an attempt to exploit vulnerabilities for client execution, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • 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 script payload in PDF stream low 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 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x2C9 84 bytes
embedded_file_obj0009.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x37A 228 bytes
embedded_file_obj0010.bin
e5147dd683552450157ce5fcb4643c082688f1901a2fe2b60d638ffa649e8d6d		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x46D 1456 bytes
embedded_file_obj0011.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x7C0 199 bytes
embedded_file_obj0012.bin
fc2e089558ac2eeb16ee8a224b2b0e23f721c2f4d7884f875e22547ef7e9a6a3		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x8B2 34083 bytes
embedded_file_obj0013.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x4346 77 bytes
embedded_file_obj0014.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x43ED 56 bytes

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