PDF malware analysis — malicious · 49584cc6baedaa09

MALICIOUS

PDF

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

MD5: 6ecb3b3106885c26709fb0096efb0c32 SHA-1: 9b50dc97ccdbe619753fdbf53922864b8b0bcf3a SHA-256: 49584cc6baedaa09b0afd118fef044740f7931991a6f8676a9eda49c1eff8b7f

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. Specifically, the 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF's metadata is used to decode and execute a stager. The 'String.fromCharCode' heuristic further suggests obfuscation techniques are employed. While no specific URLs or hashes were extracted, the presence of a JavaScript stager strongly implies the intent to download and execute a secondary 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` `2f73cea10f8e917db8e30999830da90f2c70a5718c92ef5b974d31100cf156a0`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6176	515 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.