Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c61717499f996c…

MALICIOUS

PDF

45.0 KB
MD5: e07c9cf989434252b1ec707f208add56 SHA-1: 3f9fa386fed9a07aa6b72da2660e4ee840758d1c SHA-256: 87c61717499f996c7da43c382ab6b35795925c02ec74563742d6bff5dffaf2e4
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36128 and a machine learning classifier indicated a high probability of maliciousness. Embedded JavaScript streams were extracted, which are heavily obfuscated but likely intended to download and execute a secondary payload. The presence of JavaScript actions and embedded JS streams points to T1059.007 (JavaScript) and T1203 (Exploitation for Client Execution). Given it's a PDF, T1566.001 (Spearphishing Attachment) is a likely initial access vector.

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
02f23c7ae22c3149d5def608a52e37617ded501fb16a1c443e471f70c69e26e7		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
5292c8908b022f770d988ce6d2eff322b19a2a2f9972533d803ffafb7507cb52		 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
842a616ae1430cfd1e8497cca1a5bd4fe7687ca9250babdf7aa18c16bbc4c786		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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