Malicious PDF — malware analysis report

Static analysis result for SHA-256 d164d27348cad22b…

MALICIOUS

PDF

27.7 KB
MD5: 8b90f6c0cff8999f0d97a463373073de SHA-1: 2a174e566381b54cbb2d85809312962d0cafa618 SHA-256: d164d27348cad22b0c0c46318228da486c286ff07668acbfd7327820f38df2eb
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 the malicious nature of the file. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery. The obfuscated document body content does not provide further clues on the specific 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
9206eb5fcada6a31825c7335ac0e505e49f817909269c21fa708eb8329197e1e		 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
0d30c4e4dd8eb639c8c74cbdc42daa453de9173244bc91114ce103393818c438		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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