Malicious PDF — malware analysis report

Static analysis result for SHA-256 773c32e06df4ca6c…

MALICIOUS

PDF

27.7 KB
MD5: 41af651ffbf1f7300145d5ffddf877da SHA-1: f92de38fa21b9c3448e49bfc239b8f69eab8d37d SHA-256: 773c32e06df4ca6cb2b07ee3baa81962a28010e00bdda70c04da8575ae0bffac
166 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics as malicious. The JavaScript appears to be obfuscated but is designed to execute, likely downloading and running a secondary payload. ClamAV detection as Win.Trojan.Agent-36100 further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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
c6e5394e8738c7220368c54ba4e2861836532bb29454ff4ece696f6216c50af3		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
javascript_obj0008_001.js
4a94a902985d16aa0a94b20b2177d0e916230713c74846e863361bf355bc892e		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 27871 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
f5ee6dbe1af8422198079eea099c7532e3b752cf711d870376821e27812ce73f		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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