Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6becdde1a8e8be1…

MALICIOUS

PDF

68.0 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: lxnoe (via dyqjxwq)
MD5: 06f4054075b3ec9982fee71d9d4ae6ce SHA-1: c905df2ac306d2e7171b162fe519ea35b9606430 SHA-256: e6becdde1a8e8be1b905238f8694dccfc5e21fbcd498eabb5f33e045098babc2
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated and uses the unescape() function, indicating an attempt to hide malicious code. The primary function of the script appears to be deobfuscation and execution of a secondary payload, likely for further system compromise. No specific malware family could be confidently identified.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js
9dfe192655b310d78a6bd56fac546b38afd1fca38054c1f1c9d1018a13b1832d		 pdf-javascript-stream PDF /JS object 106 at offset 0x10E53 214 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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