PDF malware analysis — malicious · 0ea62a8ed4566c51

MALICIOUS

PDF

4.0 KB

MD5: c82f2628ff8da6b876b4291cd56a890b SHA-1: 8df70d3f3c5037853e27cf2073c57136d2bf62a8 SHA-256: 0ea62a8ed4566c51e23558ab732eccbaf15bca694a9339ff1e1157977c5b2b44

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript streams that utilize eval() and String.fromCharCode() for obfuscation. The primary script, javascript_obj111612_001.js, appears to be a downloader, indicated by its extensive obfuscation and the heuristic firing for PDF JavaScript exploit cluster. The ML classifier strongly flags this PDF as malicious. The script's purpose is to download and execute a second-stage payload, though the exact URL is heavily obfuscated and truncated in the provided evidence.

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` `eb7ae9da8ba83672bab04784b82f59ec8627de9cd97cee3ebaa674470ba06ad2`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `8ccdfac485d77e40319f2e2db11682c3c0af7e2c1210b05ec105d4f8584fbf8a`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	5590 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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