PDF malware analysis — malicious · 349f53f37562fd91

MALICIOUS

PDF

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

MD5: 487ac1ecc0748fa8d3a99fb2e5f82201 SHA-1: 5bd05b087ad6f99d5be4c9b8ea4b77f45ae23d74 SHA-256: 349f53f37562fd91e244f8b6f66a32fc0b9f74b9be170a2572376e50354729b9

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics such as 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The use of 'String.fromCharCode' suggests obfuscation techniques common in JavaScript stagers. The primary function appears to be executing a stager from the PDF's metadata, which is designed to download and execute further malicious content. The confidence is moderate due to the lack of specific IOCs beyond the obfuscation technique itself.

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` `0587cb9c2710b784c928cccf16b30b406527010c8794d572e7719457b7efee49`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62BB	462 bytes

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