PDF malware analysis — malicious · b76a70de5af02efb

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: debf4703b952662a31176ea43985535d SHA-1: 262bd0633c1c6f4b5844eb77ceb0523f774f81b5 SHA-256: b76a70de5af02efb0bb38751e4e7f4ba38ad572c9f96e69e019f64ebdcab340a

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as 'Pdf.Exploit.Agent-11883'. The presence of `eval()` and `unescape()` calls within the JavaScript streams points to obfuscation techniques used to hide malicious code, likely for exploiting PDF vulnerabilities and executing a payload. No specific IOCs beyond the ClamAV signature were extracted.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-11883 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-11883
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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` `04f6c85df85590879788e57d0848ccc561dfc3126dc9aa67c65200e1f73a6387`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `3dfacc87120aa0d5e25594a3be9a936bdc907bfe83471d6a23dc8aed82f83327`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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