Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cf864fe9f386f3…

MALICIOUS

PDF

68.4 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: qbglqjg (via hxctjz)
MD5: 0b5aa4e05b9b1420bc7a4413b7937b71 SHA-1: 716325916c0d0e264a674acb2fad636a44a0ad0f SHA-256: 30cf864fe9f386f3595daa86a2dc9a5f3c11af9442b72ca1e1374297bc887a0f
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this as malicious. The JavaScript stream is obfuscated, and the unescape() function is used, suggesting an attempt to hide malicious code. The presence of extracted JavaScript files and the ML score indicate that the primary function of this document is to execute malicious JavaScript, likely to download and execute a second-stage payload. The document body itself contains no user-readable text, only obfuscated strings and code fragments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • 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
javascript_obj0106_000.js
eb534e0b1dc6b31bb9ed2261e59d5952ffe690eb2673c25ebf0f2b8af3491098		 pdf-javascript-stream PDF /JS object 106 at offset 0x10FEC 205 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0106_001.js
21898ebf1433d017e04e3b87dd0807615e0cf1865bf421da77f320558b2c658b		 pdf-javascript-stream PDF /JS object 106 at offset 0x1100D 366 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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