Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd824e6e01397120…

MALICIOUS

PDF

27.6 KB
MD5: dd15bef245ce18cef06ca255149ec363 SHA-1: 827d061e21a917417e13fddd966a993cc1539a0b SHA-256: dd824e6e01397120165a94b5841e074a00206b167bd24843fda280879b0cac47
166 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV identified the file as Win.Trojan.Agent-36100. Embedded JavaScript, including a deobfuscated stream, indicates the likely execution of a secondary payload, a common technique for malware delivery.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
69bf204c2c6741310787d0f4414e98f3a679910ed2c42d2bdbfe6f2e3e62e67b		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27477 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
cc3a0aa8a84b9a863ab02d274257e1667e29642659b534dad8240841fef34861		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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