PDF malware analysis — malicious · 99a532e188365724

MALICIOUS

PDF

26.6 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)

MD5: 19472d1586bef83bea3d8bcc9fa9340f SHA-1: 58504a56e5c90228480a3c0a18286bb2a985cfc4 SHA-256: 99a532e188365724c4172de42511c6660d613a9a3975d52950254f1508193967

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Exploit.Agent-21608. Static analysis revealed embedded JavaScript with high-confidence indicators of maliciousness, including an eval() call and ML classification. The JavaScript appears to be heavily obfuscated, but its intent is to execute malicious code, likely downloading a second-stage payload. The presence of JavaScript actions and embedded JS streams further supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-21608 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-21608
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `3374afe4f24f53699ff22522f0bc7fef5a86c9576a8359a1e608e1bfc9a8bcf5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	26117 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `ef3205d9691f872e7f596fb987b4878283d7613c851e1c3d59284c66bf117211`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	360 bytes

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