Pdf.Dropper.Agent-7233561-0 — PDF malware analysis

Static analysis result for SHA-256 179f3481accfaa1e…

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)
MD5: 60be9f764e0464d91d8383bdf5534e35 SHA-1: e8937689f68bf9974b1ee56ba01c151c00597cef SHA-256: 179f3481accfaa1e5f7a38d2c99a64ce62b47faac45f144c027e3a08200c0685
248 Risk Score

Malware Insights

Pdf.Dropper.Agent-7233561-0 · confidence 95%

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JS_EXPLOIT_CLUSTER and PDF_EVAL. The JavaScript is designed to be executed, likely to download and run a secondary payload, as suggested by the ClamAV detection name 'Pdf.Dropper.Agent-7233561-0'. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Dropper.Agent-7233561-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7233561-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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
1b39f3c1eb9ea3bfc412097cc539e532cc700cea24180f48f6b5e8709d9efe87		 pdf-javascript-stream PDF /JS object 7 at offset 0x215 35126 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0007_001.js
d39d8c52e8f6158c546b9ca9b08ba88a422e805168c0dc04bc0d39985af4eb6a		 pdf-javascript-stream PDF /JS object 7 at offset 0x215 35039 bytes

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