Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dead427c696b2c8…

MALICIOUS

PDF

27.7 KB
MD5: fe8524b64876e0a5deb4dfeb29cdfd15 SHA-1: 7148f5b5bd8e3a864e37198ecfa843ecf41c3e28 SHA-256: 0dead427c696b2c83d6c9448accf9c02dbf37d4e90503bda9f8d99ff2c3a7bdb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier. The JavaScript appears to be designed to download and execute a secondary payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36100' on the file and an extracted artifact. The obfuscated nature of the JavaScript prevents a more detailed analysis of its exact execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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
98a02d8a5b50356a8a1306950441980aac1ce3f0389efc65d9d3485c4086cb97		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
javascript_obj0008_001.js
4f2a6a1cf8e94cd7641be9384881ff2ef483a673a22aac8ab9456be4028ea54d		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 27871 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b14a7c447a629ce05a9054defee0828a59eb98f47583aa55b4588a74142d00a7		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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