PDF malware analysis — malicious · f06a129744b5c0cc

MALICIOUS

PDF

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

MD5: 44082c624e6bdfce003cee0dab6bc13a SHA-1: 76a03880a2fc285e6e362a42d2eca44976c17187 SHA-256: f06a129744b5c0ccbcdcdf4f9e446d683a73c5abef9efb9f8aa6f0cd4360171d

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_METADATA_EVAL_STAGER firing suggests that JavaScript is used to decode and execute further code, likely as a stager for downloading additional malicious content. The use of String.fromCharCode also points to obfuscation techniques commonly employed in malicious scripts. No specific family could be identified, but the overall pattern suggests a downloader.

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` `a186a715f68ce2b17dc36e70e7e6524322d2375e6e3f46b602fa695ba6c90628`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6226	468 bytes

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