Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1cb759fe3f5518…

MALICIOUS

PDF

37.3 KB Created: 2009-09-15 20:20:11 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: c23374f3ceb97535b6514f0b754cb7eb SHA-1: d647ed5fdc06462bab12b09070446fc8288ef6b3 SHA-256: 6f1cb759fe3f551859c00d84c95b3df03408116dec59789ac9f36cab715330c3
108 Risk Score

Malware Insights

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

The PDF file contains multiple JavaScript streams, one of which is heavily obfuscated but reconstructs to a URL that likely serves a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a dropper or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7270880-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7270880-0
  • 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
6df1dbd36e478b99b0f86889f7b2009528ccd70afae98e36856839d95ed2b0e5		 pdf-javascript-stream PDF /JS object 17 at offset 0x4AE8 23857 bytes
javascript_obj0018_001.js
7d6edd0d169f42a2114db1d98e4f9f954fa4f3b79c9f797832cf21988157cdc8		 pdf-javascript-stream PDF /JS object 18 at offset 0x8CE3 197 bytes
javascript_obj0019_002.js
4aa73f127b2fdedc5d8e3de61eadbd4ea9bf3d5d3fbfe8f64e6198d362e2c8c8		 pdf-javascript-stream PDF /JS object 19 at offset 0x8DA0 296 bytes
javascript_obj0020_003.js
b77376adeb1fe77d07da83987602e9b21618e3032864938b46ca73e99593e6be		 pdf-javascript-stream PDF /JS object 20 at offset 0x8ED3 179 bytes
javascript_obj0021_004.js
8248b94f507f75484832fc49cd9e5fb868e71e32db3fda8e998cf9c7b55e66e0		 pdf-javascript-stream PDF /JS object 21 at offset 0x8FA4 221 bytes

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