PDF malware analysis — malicious · 16c7930b52f16e4f

MALICIOUS

PDF

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

MD5: 1700b571a27ee47cd040f269030b05ab SHA-1: fc990c92ef5927a139193219f6c9107acc428e5a SHA-256: 16c7930b52f16e4f41e0ead10c304b104d68dbac40876257c0453cd8d8fbbe23

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains heavily obfuscated JavaScript streams that utilize eval() and unescape() functions, indicating an attempt to hide malicious code. The ML classifier and exploit cluster heuristics strongly suggest this is a malicious PDF exploiting a known vulnerability. The JavaScript is likely responsible for downloading and executing a secondary payload, though the exact URL or mechanism is obscured.

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` `8f18c2ad0999aacffdff38c960af1eef48d18636b8cc7ecc0fa000d8fa1b40e5`	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` `b8014fee0d38c0b6afa3819ce7af23cb5f2a65ded4d4ce9523b10109ba9a3cc8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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