Malicious PDF — malware analysis report

Static analysis result for SHA-256 879ae545fb05ae7b…

MALICIOUS

PDF

70.5 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: tyuzkyh (via aflqyvl)
MD5: a63839015a6d65f59d2ed69cf876446b SHA-1: 153f2e62335bca9e3780bd63d2fad2265fd3e567 SHA-256: 879ae545fb05ae7bdce959d8f84a71c6541227a4273229f50405d9d26cb98a78
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The JavaScript stream, identified as 'javascript_obj0106_000.js', likely contains obfuscated code that executes a secondary payload. The PDF_UNESCAPE heuristic further supports the presence of obfuscated JavaScript. The document body itself is minimal and appears to be a lure, as indicated by the PDF_IMAGE_ONLY_LURE heuristic, suggesting the content is designed to trick the user into interacting with the malicious script.

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
94c5e83b2fd1ad678938c1a3b50e3ed611c002ca1ca280ef0819e682a34e7466		 pdf-javascript-stream PDF /JS object 106 at offset 0x1184B 220 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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