Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a31986353e5f887…

MALICIOUS

PDF

45.0 KB
MD5: e0c6bfa5031c5b18fd137b9109ee9195 SHA-1: ba46b60f4a4c1620d6d2bfd2ef750da16db4c8d3 SHA-256: 6a31986353e5f887f99df28416f68e54c1bea1b257989c26e3fb25dd4544d39b
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript. The JavaScript code appears to be obfuscated but is designed to execute, likely downloading and running a second-stage payload. The specific exploit and payload are not fully discernible due to obfuscation, but the overall pattern suggests a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
6de3894784e45e66600926336a98e8f3363f17b679865f9f64077f60240df2c0		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
24a2a1bcfdb7a25224ad80cd5cdb0e8772f4c761ba0715492807b0c513dbc46d		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b687071c484a0278c870ce9b582e3756af978dabdbd57faa4a895374c5dc8c7b		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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