Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddd77e91024897e…

MALICIOUS

PDF

25.8 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)
MD5: 04e2f80fde76a70db03b6ef7dfdce4f8 SHA-1: 05dffe0d8f2ba53182baf20c69c1ed69a717579a SHA-256: 1ddd77e91024897ef05658a4dec21823fb7bf91630e7f3e4248833a6c96d9e62
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. A critical ClamAV detection (Pdf.Dropper.Agent-5342575-0) and a high-confidence ML classifier result confirm its malicious nature. The presence of PDF_EVAL suggests the JavaScript is likely obfuscated and designed to execute arbitrary code, consistent with a dropper functionality that downloads and runs a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-5342575-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5342575-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
ce8afdac59b89ea98da1a19422d8db684d97ca25c973ea8038399eb97c521193		 pdf-javascript-stream PDF /JS object 7 at offset 0x1EE 25260 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0007_001.js
fd259d0c0009e57dcbf47086256bf44f51c88de2ff99f712aa8174fb1568c1dd		 pdf-javascript-stream PDF /JS object 7 at offset 0x1EE 25021 bytes

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