Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ffeaf761f2b38e…

MALICIOUS

PDF

27.6 KB
MD5: 58f015eec4a604074d1d9f3c2acac8ff SHA-1: 41d392bca5177a27f40dd8586e249cadc32ec745 SHA-256: 35ffeaf761f2b38e6913110950d0ab6727b9ae114e5e2a911d7eccb03506e6a6
136 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as Win.Trojan.Agent-36100. Static analysis revealed embedded JavaScript, which is often used to download and execute further stages of a payload. The document body content appears to be obfuscated or malformed, providing no clear user-facing lure. The presence of JavaScript actions and embedded JS streams strongly suggests an attempt to exploit vulnerabilities or deliver malware via the PDF.

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
f436d57af56bfadc6820f2529ebc27d85c2d76d910de0175dbef1403035b7a54		 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
7eb1a6406f1086eb414b17cec994a04bb87bc6ad554e1f4951b41d960f7a9e5a		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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