PDF malware analysis — malicious · 56d5bcc36a00cc4f

MALICIOUS

PDF

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

MD5: 6fad6ab5ebab620515fe31702fcb2d30 SHA-1: 76ae3a7973b9ac79191762e7d9719216002c2cdd SHA-256: 56d5bcc36a00cc4f1f23b07b5a4998a92ea68d72d7beaf155a8f6f4a978dbff0

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript within its metadata, as indicated by the 'PDF_METADATA_EVAL_STAGER' heuristic. This JavaScript, which uses 'String.fromCharCode', is designed to decode and execute arbitrary code. The primary function appears to be a stager, likely intended to download and execute a secondary payload from a remote source. No specific malware family could be identified.

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` `2399d124e4e9aa0547ff17c4ba2587e4f5a58454fe9cbab8de0961376516238f`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	488 bytes

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