Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cf212495302730…

MALICIOUS

PDF

17.7 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 24753449f2f87ece0be760f999abea25 SHA-1: e9ba6d2e17deba4621c3cf8e6864b1e8ddc88f49 SHA-256: e9cf212495302730b65ae0f7418a7acc41560a33e12775b6619fb4a27cdac5b1
168 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter

The PDF file contains embedded executable scripts, as indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classifying it as Pdf.Exploit.Dropped-81. The primary attack pattern involves exploiting a vulnerability within the PDF viewer to execute a dropped payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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

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 0x207 84 bytes
embedded_file_obj0009.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x2B8 228 bytes
embedded_file_obj0010.bin
66e29aa67b809cbb5e3a2a702d31d119e67f0971f8ce1450ef32a69eb16ea991		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x3AB 1368 bytes
embedded_file_obj0011.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x6E4 199 bytes
embedded_file_obj0012.bin
9a314ea00aa63bf08b19f332ecf45749391b44cd5c41b9acafebbd940cee7a3e		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7D6 34007 bytes
embedded_file_obj0013.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x423E 77 bytes
embedded_file_obj0014.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x42E5 56 bytes

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