PDF malware analysis — malicious · 83ef7b51397493a8

MALICIOUS

PDF

15.9 KB Created: 2009-09-25 19:49:27 Authoring application: PDF Library 2.4.4 (via PDF Library 2.8.6)

MD5: 2e91efbeeaca7645cc90ba5a4d8af6a3 SHA-1: ec1e9ae1b606d3a834c0ed18e053434ed56f9140 SHA-256: 83ef7b51397493a850b7f4a3a63d2ce69d348e29027cc735c05e2c2ee718d9ee

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and exhibits several suspicious characteristics. It contains embedded JavaScript with eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the presence of obfuscated JavaScript. No specific malware family could be confidently identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `81c9197f3cdea546dc0828ff2377302c9a2a321862ca04dc4863637759be973b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	169533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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