Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1847fc741cf14b…

MALICIOUS

PDF

27.7 KB
MD5: b1782b41e3a5c050a6fff1f7af35ba99 SHA-1: 8074434743ab737b86e77894754440b66a6c2292 SHA-256: df1847fc741cf14bca3a44a1073813578403620320ab3ec9c363720f1ec9957c
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36100) confirm its malicious nature. The embedded JavaScript is likely designed to download and execute a secondary payload, a common technique for initial access and further system compromise. The document body content is obfuscated and does not provide clear user-facing lures.

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
10488784fa64aac0e2a02c9adce64b759a7500902879ad8891d6a548d2fb34e2		 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
9dcb18c5ef113bf624694c78722a3fba74c0dcf4ffc969df048c9462ef5c84d6		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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