PDF malware analysis — malicious · 74e131cc10e68fdb

MALICIOUS

PDF

9.5 KB Created: 2009-07-14 08:16:46 +01:00

MD5: 0e51ec8b0fe2f80b3bf713b0b3ca5fa3 SHA-1: 47a6c54223363c33645b6e0585a148505679c368 SHA-256: 74e131cc10e68fdb0e3a365608df23c81534b3ea79c8a64d2e4c780cf24d406c

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains multiple embedded JavaScript streams, several of which are flagged as part of an exploit cluster. One script, javascript_obj0022_004.js, contains a large, obfuscated string that appears to be a Base64 encoded payload, likely intended for download and execution. The presence of eval() calls and ML classification further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.8852

Heuristics 5

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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0023_001.js` `aa199a5de64e92cfe3347ff374fdbb8f6ef50472ea0be87a350a62da5ad12399`	pdf-javascript-stream	PDF /JS object 23 at offset 0x19C9	45 bytes
`javascript_obj0022_004.js` `bb855501d2307f65d026601bb8ab6e56bc89c65a6758562b5d93592ba0be0d6a`	pdf-javascript-stream	PDF /JS object 22 at offset 0x989	8069 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0024_005.js` `9f4116b5e1cc85dcc92bb2026b070f9be2fe02a5eb49c04c4236a3f187ede826`	pdf-javascript-stream	PDF /JS object 24 at offset 0x1A2B	2108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0026_006.js` `02d1ef82e43ea16664a1d098a8d68a53f99710994f2e69433771fd763578cf24`	pdf-javascript-stream	PDF /JS object 26 at offset 0x1C3E	2785 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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