PDF malware analysis — malicious · aa2cb04f70a88766

MALICIOUS

PDF

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

MD5: 5b15614afa6b46d927bf246e18cd75e2 SHA-1: e4008e45be274720f0f2ccc1f522944ddb31d992 SHA-256: aa2cb04f70a8876693079933d53195077af4b7f0bacea1a87485b498bb4973b2

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains JavaScript embedded within its metadata, triggered by the 'PDF_METADATA_EVAL_STAGER' heuristic. The use of 'String.fromCharCode' suggests obfuscation techniques common in JavaScript-based malware. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the specific details are obscured. The file's metadata also indicates the use of 'String.fromCharCode' in its creation.

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` `a49c558c0476b04657d17dc53029feb8482e8e39ec50e5d9552dee833a981a60`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6236	531 bytes

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