Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfa5cfee7b6021a…

MALICIOUS

PDF

36.9 KB Created: 2009-09-15 20:20:11 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: b21aa8cfb60a558f8ebd390152db6141 SHA-1: 231a2591052f7b73ac9c153b2be11714b002cd2c SHA-256: 4bfa5cfee7b6021a22487944f97fac4ab660f02275033ed4fc8caad30a4c3a02
108 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Dropper.Agent-7212215-0 and a machine learning classifier with high confidence. It contains multiple embedded JavaScript streams, indicating it is designed to execute malicious code. The primary function appears to be downloading and executing a second-stage payload, though the exact mechanism is obfuscated within the JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7212215-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7212215-0
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
fc9ff27fab087aa9f52f0d3de0a4f926614fe7cfed83839e97c43b0ffc49ab53		 pdf-javascript-stream PDF /JS object 17 at offset 0x4AE8 23932 bytes
javascript_obj0018_001.js
832419d150648dbb27911936cc495ee54b325318178bff07be51c39d8600a463		 pdf-javascript-stream PDF /JS object 18 at offset 0x8B88 145 bytes
javascript_obj0019_002.js
31f57776fc4f31492446f81a1b2a04872859a6956f626092993cdb3e197daedb		 pdf-javascript-stream PDF /JS object 19 at offset 0x8C4B 393 bytes
javascript_obj0020_003.js
0ff9cab1108488c695d5c0df4165c13597dd7c09952e33a5220c534f716b9e57		 pdf-javascript-stream PDF /JS object 20 at offset 0x8D9E 137 bytes
javascript_obj0021_004.js
e9004416179529615882882c3a6b3bf88e8439f13fe255301d832528434d1703		 pdf-javascript-stream PDF /JS object 21 at offset 0x8E5A 203 bytes

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