PDF malware analysis — malicious · 94f7e6a0aeca7f1a

MALICIOUS

PDF

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

MD5: 7fd93a625d1da9e026621754f19bfe6b SHA-1: 8a3d205af6215eadd1e2193dd3625fec68786e9a SHA-256: 94f7e6a0aeca7f1ae3972627e720ef1592a49472a4ad8248eda7d82d2385031e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_METADATA_EVAL_STAGER heuristic suggests that the JavaScript is used to decode and execute further malicious code, likely acting as a stager. The embedded JavaScript file, 'javascript_obj0001_000.js', is the primary artifact. The use of String.fromCharCode further supports the obfuscation and dynamic execution of JavaScript.

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` `08c8ebf7330b56e607ffbefb4857716b328fefd00579e667d53352feedd4ddfa`	pdf-javascript-stream	PDF /JS object 1 at offset 0x626B	510 bytes

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