Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d16f20009cfa3b…

MALICIOUS

PDF

9.9 KB Created: 2008-11-07 21:45:08 +01:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 84bc91579cd4dbee7faf3ee09c4a9a4b SHA-1: 645c95e21872e0446b7f0f2c6d147d0a4acb0e81 SHA-256: e1d16f20009cfa3b2055fe6df34bf1c81c97766a02dc6496941fda11a28ec5d3
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is obfuscated using eval() and unescape() calls. This obfuscated script, found in javascript_obj0027_000.js, is highly suspicious and likely attempts to download and execute a second-stage payload. The PDF itself contains no readable text, relying on the embedded script for malicious functionality.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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.
  • 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_obj0027_000.js
321ccf3d6c8eb48d7590399506f2ae40ce5d81b227bf30b139e90bd132af79dc		 pdf-javascript-stream PDF /JS object 27 at offset 0x5FD 5471 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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