PDF malware analysis — malicious · 8a6bc189a84f7c3f

MALICIOUS

PDF

25.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 3de937b5d44039f1dd1a6d422cbcfacc SHA-1: eee28a820de7d88a429c4e44ace429a7d4f15143 SHA-256: 8a6bc189a84f7c3f4a71577950344ec2594870a92c53936d167e4124ba50710a

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, specifically utilizing String.fromCharCode and an eval stager within its metadata. This technique is commonly used to obfuscate malicious code, which is then decoded and executed. The primary function appears to be the execution of this JavaScript, likely to download and run a secondary payload.

Heuristics 4

PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `9cd2c82330a5b749b376678fc08b62832c766937a6961237002b8610882fd458`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61D1	454 bytes

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