Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50fc790ccf91c53…

MALICIOUS

PDF

101.4 KB Created: 2009-06-06 21:05:54 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 0891fd230817c61ef387ae3cec02ccac SHA-1: 024d6930cc43eedceb6fcc8fe9bceb9bbc5b369b SHA-256: d50fc790ccf91c5391aedf696e6da2439c9bc0ea12ea15ae476765a866ff0f0d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'ML_NYX_PDF_MALICIOUS' classifier and 'CLAMAV_DETECTION' with 'Pdf.Exploit.Agent-6011' strongly suggest malicious intent. The presence of an extracted JavaScript file ('javascript_obj0022_000.js') and the 'PDF_UNESCAPE' call point towards obfuscated code designed to execute an exploit or download further malicious content. The benign URLs extracted are standard PDF metadata namespaces and do not indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-6011 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6011
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pdfx/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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js
e169480a1b0c26b935c435e8614713183a8d2f47ef0b9169938722d3c4483638		 pdf-javascript-stream PDF /JS object 22 at offset 0x17EA8 5798 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s).

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