Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9dae73c36e99d…

MALICIOUS

PDF

66.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: wixbbrs (via ndjsumv)
MD5: 79e390c3d6522291986d372dfc75e4cd SHA-1: be74bbdf499e0f7a22fa77b9cae4108897dd9a67 SHA-256: b8f9dae73c36e99d99e9400eb36a5b3af32eea769ed857befa5f138e354187ef
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF contains embedded JavaScript that utilizes the unescape function, a common technique for obfuscating malicious code. The script is likely designed to download and execute a second-stage payload from a remote source. The PDF itself contains no readable text, relying on the embedded script for its malicious functionality. The presence of JavaScript actions and embedded JS streams points to a downloader or dropper attack.

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
591469bc63988b6de7b29b5128f15afc9cbd788b8afc827d2d5235357449b39a		 pdf-javascript-stream PDF /JS object 106 at offset 0x10729 210 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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