Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26cc45cbb9dc44e…

MALICIOUS

PDF

98.3 KB Created: 2009-08-11 12:43:52 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: 0e5f8feaee038e7b78577655f2560c2c SHA-1: caa5b1d1d0f94a3f480b68dae40f473c193cbe7a SHA-256: e26cc45cbb9dc44e8a8ee39ea1398b30c40d63a7c4e37db3ac5870ae461d245c
150 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript actions and streams, coupled with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, points to a dropper functionality. The primary attack vector appears to be the execution of this JavaScript, which is likely designed to download and execute a secondary payload, as suggested by the 'Pdf.Dropper.Agent-7315354-0' ClamAV signature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9603

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-7315354-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7315354-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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 1 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0062_000.js
2810f92536061bf4bce2fdf82d70d286340c070b2461787063f46c34cfe35386		 pdf-javascript-stream PDF /JS object 62 at offset 0x12770 44093 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0063_001.js
3171444744792d680898904f01a588b425cbf2c674df99341d4ee60108fd870b		 pdf-javascript-stream PDF /JS object 63 at offset 0x16F28 10688 bytes
javascript_obj0064_002.js
beb8f5a45d5ae454030ee8c7aec9cd5ac844bc3b1a6b4f833cb0539b55a5b536		 pdf-javascript-stream PDF /JS object 64 at offset 0x17F6C 67 bytes
javascript_obj0065_003.js
c77daa4ac3352ecb21a4c0856e6fede2bb563b69e85d16bfc3378c74650cdb7d		 pdf-javascript-stream PDF /JS object 65 at offset 0x17FEE 65 bytes

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