PDF malware analysis — malicious · 18a35fd76d2dba9a

MALICIOUS

PDF

4.1 KB Created: 2008-31-20 53:85:00 Authoring application: Gfj37dns (via sfj37sdjhbsksp)

MD5: 33d1d28e608233059e5702f68777e662 SHA-1: 35daa43740894414e8bfc55605054eb80abe7e4a SHA-256: 18a35fd76d2dba9ab0be1d54ed57ffad1071fdea7e0e23b978b75186f189c466

150 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. The JavaScript is designed to download and execute a second-stage payload from a hardcoded URL. The ML classifier and PDF JavaScript exploit cluster heuristics strongly indicate malicious intent. The obfuscated script and the download-and-execute behavior are characteristic of many malware droppers.

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 (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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `796953203bc3f0f46511b6621dd82b7ac09dfaa7bfc9dfa3fcba33fde2c09551`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3B6	8329 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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