PDF malware analysis — malicious · 58ae84948bb6e7b0

MALICIOUS

PDF

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

MD5: 5c5ef60364a05f971666349f7390e2cf SHA-1: ab7b72a8884868be51a54b4c719e3074d5dbe4ba SHA-256: 58ae84948bb6e7b09fad95be94133c0d58bdc561b0b282119afcb01cbd7e2f7d

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains JavaScript embedded within its metadata, indicated by the 'PDF_METADATA_EVAL_STAGER' and 'PDF_JAVASCRIPT' heuristics. The use of 'String.fromCharCode' suggests obfuscation techniques common in JavaScript downloaders. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the specific URL or execution method is not directly extractable from the provided evidence. The confidence is moderate due to the obfuscated nature of the script.

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` `fc67ade156533ce4266662379e3457258e4b489a0a97c41019b7c8a23dd65cae`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61BE	467 bytes

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