Malicious PDF — malware analysis report

Static analysis result for SHA-256 827f09e8ccc0acdc…

MALICIOUS

PDF

27.7 KB
MD5: 2850b38ec1f79cf927170fe02d605a7b SHA-1: b39caae5d08c5be90dbb156ec3ba11306cff6834 SHA-256: 827f09e8ccc0acdc7ae5e516741b44ff007418ea2c3f426505d5f1365f2d61ab
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 confirm the file is malicious, specifically identifying it as Win.Trojan.Agent-36100. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery.

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
ec9a399585d372dd0b3623daf76bfcae80ba614b989e8c2b8dc63ce5aa6ae6c5		 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
77d000d63c57e16d405dfcf9a14b71bcb204939480a658aca0c49c860ebd04df		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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