PDF malware analysis — malicious · 659f1d37b9fcfbe7

MALICIOUS

PDF

20.3 KB Created: 2009-10-03 19:43:17 Authoring application: PDF Library 5.9.5 (via PDF Library 6.7.9)

MD5: cfd6d8a18ce313ef3f00bc94a952389c SHA-1: 7ac6f0fb9bf1c56fd3b219b1d46c5ab5d90a8942 SHA-256: 659f1d37b9fcfbe7842e3503601f0c71839b1411a555530554eb9471bb95651b

186 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes unescape functions, indicating malicious intent. The ML classifier and heuristic firings strongly suggest this is a malicious PDF designed to exploit vulnerabilities and execute arbitrary code. The primary function of the embedded script appears to be downloading and executing a secondary payload, though the exact URL is obfuscated within the script.

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Suspicious extracted artifact medium 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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `6e9017ec566d32221af7ca0769650ee480d120cc9f01024f5e7597f1848ecdba`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	22142 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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