Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0b0af9e98746e9…

MALICIOUS

PDF

17.7 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: ecedf051d3afd334fc3112e87fa297b5 SHA-1: a2ab4b6860dd78aa338103eba0f8274b73aba339 SHA-256: 4b0b0af9e98746e923354d87163f217f269641679c8446ace1a2f4ba79eba4e4
168 Risk Score

Malware Insights

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

The PDF contains embedded script payloads and XFA forms with risky executable scripts, as indicated by multiple high and critical heuristic firings. The ClamAV detection 'Pdf.Exploit.Dropped-81' strongly suggests this PDF is designed to exploit vulnerabilities and drop a secondary malicious payload. The ML classifier also flagged this file with high confidence.

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 0x213 84 bytes
embedded_file_obj0009.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x2C4 228 bytes
embedded_file_obj0010.bin
05bf0f5e0bb549eef5b3be7eafb55e936c944ee32ef3bd8c991210d95dd43245		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x3B7 1361 bytes
embedded_file_obj0011.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x6E8 199 bytes
embedded_file_obj0012.bin
89e660f5a825dc87ad4977caec2cee954d717103db9f50e2e708a19efef36455		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7DA 33961 bytes
embedded_file_obj0013.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x422C 77 bytes
embedded_file_obj0014.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x42D3 56 bytes

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