PDF malware analysis — malicious · 75bcf04ae107da56

MALICIOUS

PDF

3.9 KB

MD5: 357c7727dd0916c9e715f6b6a22246e0 SHA-1: 17eb9f52c6f89b27612bbdfe657ca9658ebc9425 SHA-256: 75bcf04ae107da56577d6ad6f3cd1adef6a5267e5670a91c06fe34b92349a1a6

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation and execution. The primary JavaScript stream, javascript_obj111612_001.js, is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of PDF JavaScript exploit cluster heuristics and a high ML classifier score indicate malicious intent.

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj111611_000.js` `18bf9062b39d30313c58ada05e206ea953cd013fabeaed21e2b7b7507cacc914`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `0bfb566f1fc4e8b6c2d8c9d42a33f7f48c9ec942730de9de5df36c2d62ec257a`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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