PDF malware analysis — malicious · 81217c0bfbb9806a

MALICIOUS

PDF

4.3 KB

MD5: 50c3c9f92c1533bb5f43ef834dacb1de SHA-1: b6014a06af5dee11c0eae4a09ac8eca98b83185d SHA-256: 81217c0bfbb9806a368137883c1bdb0874898f52521f77204365b9f5062b393f

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, indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL' heuristics. The JavaScript is designed to download and execute a second-stage payload, as evidenced by the 'ML_NYX_PDF_MALICIOUS' flag and the presence of an embedded JavaScript file. The obfuscation and eval() calls suggest an attempt to evade detection.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj85723_000.js` `4e1ccb8d0a429839480bc7f80a38612027a88bb2d141fb725df2b409493675c3`	pdf-javascript-stream	PDF /JS object 85723 at offset 0x134	8310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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