PDF malware analysis — malicious · 6184a1ea4c03847d

MALICIOUS

PDF

2.4 KB

MD5: 41a87f5cca03816301d076f126e99934 SHA-1: 92773fe289b4ca80ef8433db4e28dfbed3c19325 SHA-256: 6184a1ea4c03847d7bd802173031ab6784b3d7c98747b390a9f9db3b3f7fcfbe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript streams, one of which is heavily obfuscated and appears to contain exploit code, indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The script likely attempts to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious.

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_obj1179811_000.js` `749fee6b8ae0c1a3395c927d24154981e9cad061ac473180143f128f0dbfaa28`	pdf-javascript-stream	PDF /JS object 1179811 at offset 0x19A	2458 bytes
`javascript_obj1179812_001.js` `368822260fd6bb922f3f38778dce1ce707fd9c972c4c8c9dcc3aaae8e7dba0b8`	pdf-javascript-stream	PDF /JS object 1179812 at offset 0x7CE	486 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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