PDF malware analysis — malicious · 5e6e5ddbddf0a089

MALICIOUS

PDF

67.4 KB Created: 2010-03-17 13:20:28 Authoring application: Cfsq4aHl (via Kf7KtEjSA)

MD5: 78447baeb064104d24ce5d440914dd66 SHA-1: 099b3b3b0756f05835951ed2557586530015def5 SHA-256: 5e6e5ddbddf0a0895fbe6e52bc02bc70fd2f838767d13bd6830bc4c79ddcca45

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. The ML classifier strongly flags this PDF as malicious, and the presence of a JavaScript exploit cluster suggests it's designed to download and execute a secondary payload. The obfuscated JavaScript and exploit cluster are the primary indicators of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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_obj0007_000.js` `bbac5811b5a97e5ac8b4bc625746edf7415130de3b7d9c3d92cc41ba94313092`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23E	67748 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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