Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b6d642bb2e96ef…

MALICIOUS

PDF

37.5 KB Created: 2009-09-15 20:20:11 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: 8bf83af16e95ff0187622579b3d453d9 SHA-1: 001d92fc29146e01e0ffa619e5dbf23067f1e814 SHA-256: 75b6d642bb2e96eff14d087fcfc66f64cc9c116502f391224f5c190557ab006a
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics, and is detected by ClamAV as Pdf.Dropper.Agent-5341870-0. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a second-stage payload, a common technique for malware droppers. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-5341870-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5341870-0
  • 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
9c6cf67542abca16363d1a0c45b6fee9adeda5cfc4cccc113b6b8b7b39418264		 pdf-javascript-stream PDF /JS object 17 at offset 0x4AE8 23972 bytes
javascript_obj0018_001.js
6ff8dcf27fb6862acdff59fc8dfa62125d4969cd10607953888803512077b86e		 pdf-javascript-stream PDF /JS object 18 at offset 0x8DA7 182 bytes
javascript_obj0019_002.js
be57ff4c8602a28fd72cad5a0125e6b087a86a4db5af24affeaa9151d013ea58		 pdf-javascript-stream PDF /JS object 19 at offset 0x8E72 329 bytes
javascript_obj0020_003.js
c5154d797d4bc9037e910689b1322d307f360740ff241f848f3f2061b03e962f		 pdf-javascript-stream PDF /JS object 20 at offset 0x8FB5 182 bytes
javascript_obj0021_004.js
16821cf1dfb515aa8b06637327906d1812312c31a1c69ef24f6f123aaecfd414		 pdf-javascript-stream PDF /JS object 21 at offset 0x9087 186 bytes

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