Malicious PDF — malware analysis report

Static analysis result for SHA-256 f230a397514b8db4…

MALICIOUS

PDF

21.3 KB
MD5: 20c98725fbdad6effb800ea1e842670e SHA-1: d395cf0118a2de5f86c3be3ad5fe7992ed17bb49 SHA-256: f230a397514b8db4b27a2ddda67964bc7398815417cf676e28e01093e439a3b5
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely serves as a downloader for a second-stage payload. ClamAV detections (Win.Trojan.Agent-36169) on both the original file and an extracted artifact further confirm its malicious nature. The DOC BODY content appears to be obfuscated JavaScript code rather than user-readable text.

Heuristics 5

  • ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36169
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
fa841336addcfa2f870c1cd99e1d1caa9c53ba6cc864082d28c9c3097d9a273c		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2019 bytes
Detection
ClamAV: Win.Trojan.Agent-36169
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
630bbd87d4c991442612bbfc5d0e64a58d98100212c3f8e897f80b45684ffd16		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 1262 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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