PDF malware analysis — malicious · a5943b9dad30f26c

MALICIOUS

PDF

4.3 KB

MD5: bbefade54707058bd895f01a81237de4 SHA-1: 8e1b842f29ab2252438bffbc41f7f94c33738d80 SHA-256: a5943b9dad30f26c239e3bef56a57a15f58dd0fcfd4e3bae8f5c3cd1aff49844

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode(). This script is designed to download and execute a secondary payload. The heuristic firings indicate a high likelihood of malicious JavaScript execution within the PDF.

Heuristics 5

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_obj45697_000.js` `d84969d8950bf920a9992663ab67fad22bdc585127947c02845d228ef0a94c20`	pdf-javascript-stream	PDF /JS object 45697 at offset 0x139	8306 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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