Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade605fba8585df8…

MALICIOUS

PDF

263.2 KB Created: 2001-09-10 15:47:24 UTC Authoring application: Acrobat Distiller 4.0 for Windows
MD5: da21f1da8b7a05b45242ec9b0d899690 SHA-1: 53c1393a221a26c5274f020c27fa8eecf957762d SHA-256: ade605fba8585df83a44a6c0049a4687664e729cba81adbb6ae8ebc6af417e4e
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated code execution. The CCITTFaxDecode heuristic combined with the CVE-2010-0188 indicator points to a known exploit path. The extracted artifact 'javascript_obj0135_000.js' is likely the payload. The benign URLs are likely unrelated to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3612

Heuristics 7

  • CCITTFaxDecode + TIFF/XFA exploit prep — LibTIFF CVE-family indicator high CVE related PDF_CCITT_CVE_2010_0188_RELATED
    PDF uses /CCITTFaxDecode together with TIFF/XFA exploit-preparation markers such as rawValue image-field assignment, TIFF data, or heap-spray JavaScript. This matches the delivery pattern for Adobe Reader LibTIFF/CCITTFax parser exploit families, including CVE-2010-0188, but does not prove the exact malformed TIFF primitive.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0135_000.js
ca2c34fbd62c0f2b212d935995d68160a4b677acb6920f60baf443e9e3c891cc		 pdf-javascript-stream PDF /JS object 135 at offset 0x3FEB5 1446 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s).
font_00_sfnt_off00031711.bin
d194d25a4cecdf25153242568a168e246e2411f73127f0d7e99f6364acb8c325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31711 11112 bytes

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