Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf65d1a07b82969…

MALICIOUS

PDF

17.8 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: bfd98b7d6e2dee58f2529e3fb8f70f38 SHA-1: 6f6e605241219da3aeb6f44f0fc8f630e483b3ad SHA-256: 7cf65d1a07b82969d590a834931fb0e50cbba024ae69ae9dbf6353bb3b4ceb4e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing Link

The PDF document contains embedded executable scripts and was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The presence of XFA forms with risky executable scripts indicates an attempt to exploit vulnerabilities within the PDF reader to execute arbitrary code. The embedded file objects further suggest the delivery of a secondary 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
047509f77ab74542f5e7545a5a9f4446fc33d63af5b2d22ca4adec2aca6d9815		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x3AB 1355 bytes
embedded_file_obj0011.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x6E1 199 bytes
embedded_file_obj0012.bin
8a3edb96fa547f5fca264eac083123cfd5727797b0d9c2101f65df7b879b374a		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7D3 34165 bytes
embedded_file_obj0013.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x4261 77 bytes
embedded_file_obj0014.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x4308 56 bytes

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