PDF malware analysis — malicious · 09651ed3b0007cfe

MALICIOUS

PDF

4.6 KB Created: 2008-31-20 53:85:00 Authoring application: 2974 (via 2974 4.3)

MD5: bdbb00184aa8c8dffedcd7590ad4b673 SHA-1: 508d72481051fa71b4ed9a8042bc054206687661 SHA-256: 09651ed3b0007cfe4f4c2b455062c64c8a6c1de73d37b3f617c754cf7e8cc7f2

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file containing obfuscated JavaScript. The JavaScript utilizes eval() and unescape() functions, indicating it's designed to execute malicious code. This code likely downloads and executes a second-stage payload, as suggested by the PDF JavaScript exploit cluster heuristic. The ML classifier also strongly indicates maliciousness.

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` `0549f26bdca8d81a3f6756d7025169d5711ad89df6ef68e528e1199136fd8615`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	72898 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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