Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0925942b5ec9537…

MALICIOUS

PDF

58.9 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 2a7b8180da2906c9889f13fa912df6a0 SHA-1: 34112e3bfae1a5db97c5a3242db9e332014891b5 SHA-256: c0925942b5ec95374db4313dd32d2a2a7a267fa00645ae8b6638ab559bf63fee
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, which identified it as 'Pdf.Dropper.Agent-7142890-0'. The presence of embedded JavaScript streams indicates an attempt to execute malicious code. While the document body contains mostly garbled data, the heuristics and ClamAV detection strongly suggest this PDF is a dropper intended to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7142890-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7142890-0
  • 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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0018_000.js
8280400ea03c10639edf0df26c35dc7d76fc0ee3247bf00f9c0fed4131494f96		 pdf-javascript-stream PDF /JS object 18 at offset 0x4B0 2662 bytes
javascript_obj0022_001.js
d0105e603cae51c621806ef153b1b14958ffdc8b91e4b068bd2a3f2e7e59d502		 pdf-javascript-stream PDF /JS object 22 at offset 0x23CA 2663 bytes

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