Malicious PDF — malware analysis report

Static analysis result for SHA-256 3603235c75c0eaaf…

MALICIOUS

PDF

14.3 KB
MD5: da6eb01aa15463aaa532992f1dc282f2 SHA-1: 96042886bc7dc9a027bdaaf0ae80461bed69fb67 SHA-256: 3603235c75c0eaafca0eeed378ff68e24e182a064cf00e13a34d18fc14cb20f9
96 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream that utilizes eval() and String.fromCharCode, indicating it is designed to execute malicious code. The ML classifier also flagged this PDF as malicious. While the specific JavaScript payload is obfuscated, the presence of these indicators strongly suggests it attempts to download and execute a secondary payload. The benign URLs present do not detract from the malicious nature indicated by the JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6243

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000004ac.bin
4447bc3bf2370788a868beaf4e818cbde6061d04686c8a8695d700584551fe2b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC 4794 bytes
objstm_0025_00.bin
8b4886c9285fc6b8261233f8d1dcf8084b962d540a69034e522cf4fef3a5ceff		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 428 bytes

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