Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c25e3e535341a29…

MALICIOUS

PDF

45.0 KB
MD5: e7c11538a5ab92cfb5bbd4839523ca37 SHA-1: ee4f1b779942cd996cc6fb9e8a3d17cfd58511b1 SHA-256: 7c25e3e535341a29b87f592536d7e16a08a8d3dd735709b11a22969df26f2781
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, as indicated by multiple heuristic firings and the presence of the 'javascript_obj' artifacts. The ClamAV detection 'Pdf.Exploit.Agent-36128' strongly suggests this is a known exploit. The JavaScript code appears to be obfuscated but is designed to execute, likely downloading and running a secondary payload, which is a common technique for initial access via spearphishing attachments.

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
060b10f7c4ebfaae7fd5894428e8aa002a47b0268ce70eb18a5134026f3d0bcd		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
08dc11ebfd8af09cd7c22ecb00bff30219daf87a10b13859bd2900b3e50f0f66		 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
cd4c9d233cf46f55a3872534b04a36ce988778554a8f1cf9c3c80bbbebc97711		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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