Malicious PDF — malware analysis report

Static analysis result for SHA-256 08add391d9ebb855…

MALICIOUS

PDF

45.0 KB
MD5: 69cb398cf2bf90af7a4be41759ecfe33 SHA-1: 79305fb034756620ac6e74c3088df85aa5037674 SHA-256: 08add391d9ebb855710ffeda613736c31ec7503ba4fabd64a26c24ba0bf52087
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript streams, flagged by multiple heuristics and ClamAV as malicious (Pdf.Exploit.Agent-36128). The JavaScript appears to be obfuscated but is designed to exploit a vulnerability within the PDF reader to execute code. This execution is likely intended to download and run a second-stage payload, a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
f1a822e611766269bd108ba2ce215401e9a02a498f046bd37903d53485a29048		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
1613727aa4d2627dac4b0b577bdee40c32a728a9b4ed2538fd629783732ab103		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
5c7eb0b9a8005c814ea4e92493b1793b76b07ca752672d029641c13f974a648c		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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