PDF malware analysis — malicious · 6347079ae6ac8864

MALICIOUS

PDF

2.6 KB

MD5: b72163b1d5fbc0f2e88e984bf0ac601e SHA-1: 3fa59175f94737763ed61b63428919727ce0f029 SHA-256: 6347079ae6ac8864a712f1a87724af3235e84121c13e36f0af2bb9138ee692f8

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to construct and execute code. This script is designed to download and execute a second-stage payload, as indicated by the PDF JavaScript exploit cluster heuristic. The ML classifier also strongly flags this PDF as malicious. No specific family could be identified due to the obfuscation.

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_obj111711_000.js` `b099c6352547e0335789de8abf73210fc8b66e449810c447b35bc73e2c7e4abd`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2434 bytes
`javascript_obj111712_001.js` `509eeded953414204a9fdc24447f1837b0720e5826f7ea40b28207d0899e8f12`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x85A	622 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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