Malicious PDF — malware analysis report

Static analysis result for SHA-256 048be03b5c8aa814…

MALICIOUS

PDF

45.0 KB
MD5: 9601eef6be57af372f6b121b597109e4 SHA-1: 18327ec13eda375f63a4142b550bd4f055281df0 SHA-256: 048be03b5c8aa814dbac44861af886f965ea4fd25da189f74d00318fa09770a7
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 execute code, likely to download and run a second-stage payload. The ML classifier also strongly indicates maliciousness.

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
299136890ff3acf2cce1b936d9fa7c924894d56b037034b55c0f80a28665b227		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
5e0d6db78682e7581a1dfd15d6a95f261104dd34ed4c4b973514069bddd07ddf		 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
5d06ee05100262392b77f3053173cb5c140e57f19c8d13d7e67522a3886efc53		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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