PDF malware analysis — malicious · 70b7cfb8bea53c18

MALICIOUS

PDF

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

MD5: f93e289bb382d7ea4df5c992c2e525ac SHA-1: 721440b7137e0830ceec40bee9fd30bc6d6db3c8 SHA-256: 70b7cfb8bea53c18c2410078396877351a620bad0c1985b08fdcebb7c8eee1c2

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains heavily obfuscated JavaScript streams, indicated by multiple heuristic firings including PDF_JS_EXPLOIT_CLUSTER, PDF_EVAL, and PDF_UNESCAPE. The JavaScript is designed to be executed, likely to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious. No specific family could be identified due to the obfuscation and lack of unique indicators.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `6dd28b75f86dad54110e4656fbe574689ce3f1e14b3267e1fb1d26ae6c494475`	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` `bb45889bb95fecd5d362164a09f64d147fccb68c8d8f0a3712880c8bd85618a3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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