Malicious PDF — malware analysis report

Static analysis result for SHA-256 763ec7c8059f6b15…

MALICIOUS

PDF

45.0 KB
MD5: 7083e96fff23df4f434e034cba6158b2 SHA-1: 1c1e91cbd255470a6f97ebc18afb85a58fdc1a69 SHA-256: 763ec7c8059f6b1518f72ff1db41b502019addc8674e43485e5193a39655c013
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 heavily obfuscated but its presence and the ML classifier's high confidence indicate an exploit is likely being leveraged. The primary function of the script is to execute arbitrary code, which is characteristic of a downloader or initial-stage exploit.

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
612ca1b9bc8891be1516d856d9d2f8412eb54bb925af039949b710c73234eb2f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
a06cca9c2dbe5a4cbea8a3f1ae3605946f26c532df6dcdd90a22c48b77bfb682		 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
e782ee10983270474322d1c3c643c40a7f4b6aaf6bc7a72a122e8c94c802c12e		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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