Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b7bb42ea9a0fb2…

MALICIOUS

PDF

27.7 KB
MD5: 3c51ca02f1ee4ce78a762952572a49ba SHA-1: 85afd5f2b3917c591d90003a6d7af528cc2049a2 SHA-256: b6b7bb42ea9a0fb21dc6d6d8efdac46b0bc38b1cd1af12e35f5edc83a2b4181c
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. ClamAV detections confirm the malicious nature, identifying it as Win.Trojan.Agent-36100. The embedded JavaScript is likely responsible for exploiting vulnerabilities within the PDF reader or delivering a secondary payload. The document body content appears to be obfuscated or malformed, providing no clear user-facing lure.

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
287bfb03cfb3f10e9d9bb71c73dd33b594160f41589b316f50304b4a8cdb824e		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b26f82ef443dc8246df394da3724581d5162e91af254a7b7057f68140e2fb096		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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