PDF malware analysis — malicious · a6f726975b401dea

MALICIOUS

PDF

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

MD5: 8db78401ed45ae794f3759001359cb49 SHA-1: c9aac5f9e63cec70a7ef62b3894ce10e050a3355 SHA-256: a6f726975b401dea273d4d5c9138c75a369ad29779fc8336ca5d385ed3a7bf3d

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a payload, likely leveraging the 'String.fromCharCode' function as seen in the document body and heuristics. The exact nature of the payload is not discernible from the provided evidence, but the technique suggests a downloader or initial execution stage.

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` `b92bece096eb840e5d7f8ad59c6d3208bba6cecd2423128f59cce49e317d088d`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6291	535 bytes

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