PDF malware analysis — malicious · 4df441f3c1acbbdc

MALICIOUS

PDF

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

MD5: 57797eeeb1a576a51579c2660d90073d SHA-1: cf2e0d6b2cb5e476ceb276df7b0abf7ca9a6d96e SHA-256: 4df441f3c1acbbdc65d28bf10a8b65e4897f3bdf821b91f72969468d5565baf1

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF's metadata is used to decode and execute code. The 'String.fromCharCode' usage further suggests obfuscation techniques common in stagers. While no specific URLs or hashes were extracted, the presence of a JavaScript stager strongly implies the document's purpose is to download and execute a malicious 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` `342645b0f5f7a6ebc1f093c3a8928b3351bbe86dbd1b705621ad9c122b75f9ba`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62BC	527 bytes

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