PDF malware analysis — malicious · 18dddf0175b42232

MALICIOUS

PDF

4.5 KB Created: 2008-31-20 53:85:00 Authoring application: 6623 (via 6623 1.4)

MD5: 0b2f807193b4a4a1194bd4cfdbecea0f SHA-1: d44053a0dcac1a6bae558def830cfcdee811ba62 SHA-256: 18dddf0175b42232b2362dd29499d17654df1533464828c62a0e3d643d47581e

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicating an attempt to hide malicious code. The script reconstructs to a URL, suggesting it is designed to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious, supporting the conclusion of an exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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 (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `466b6ad5dd9e08833b40c0a6fd1ded201f3abadb8a309f2f14cf1cb6aec82b9e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D3	70210 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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