Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f3db7bd80b72bb…

MALICIOUS

PDF

68.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: ojmzxy (via fpqqsbo)
MD5: db4bdb19a79d78e5083094016f84346d SHA-1: ded75bc93ce00c918eaae2321b3d863f10b82e67 SHA-256: 56f3db7bd80b72bbdaab7f5b0baccb2905e824e8f629142053b104aa5b678af1
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF contains embedded JavaScript streams that are obfuscated and utilize the unescape() function, indicating malicious intent. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript actions and embedded JS streams, along with the ML score, suggests the document is designed to execute arbitrary code. The extracted JavaScript files, javascript_obj0106_000.js and javascript_obj0106_001.js, are the primary indicators of this malicious behavior, likely serving to download and execute a secondary payload.

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
d53f6d84fa5b3845f7aa40ea4eebfd93dd236ee0aaa20d4fe4fbe60866987821		 pdf-javascript-stream PDF /JS object 106 at offset 0x10F1F 207 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0106_001.js
92b5b9c113cd23c83748452f830147c94f60a0c1c2a8c776b442b7faf1148f78		 pdf-javascript-stream PDF /JS object 106 at offset 0x10F40 368 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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