Malicious PDF — malware analysis report

Static analysis result for SHA-256 122df270cedd4991…

MALICIOUS

PDF

45.0 KB
MD5: 8852b6faff8fddee66d2a3b5cf081838 SHA-1: 60cef6a2510095205d19b0357c712ac2424d5357 SHA-256: 122df270cedd49912646779e467afbda2a07f0e07c0903481a583acb239a349b
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically identifying it as an exploit. Embedded JavaScript streams were extracted, indicating the likely execution of malicious code. The JavaScript appears to be heavily obfuscated, but its presence and the exploit detection suggest it's designed to download and execute a second-stage payload.

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
0a451cc4704606af5e74e5e129ed9684513a0fe4667cf3fddbe3383a30787ff6		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
366bcf089a2e258f4c1ab4f1fa73537e47e54544bef797d67d1cb9164ef283ff		 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
bdfb79dcba9e690f0e5dd6ecbe8a4036017defae6aec5e77f48eab632c228296		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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