PDF malware analysis — malicious · fd0dbfb57f9e816f

MALICIOUS

PDF

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

MD5: 50527bc4f435005a5d0efc55b3c1aba6 SHA-1: f4b818c3c2eba3c5c39dc5fdbc32424176f0146c SHA-256: fd0dbfb57f9e816fd0ce1ab43e097ca290a9e9bc3898f02e99ace37b666581eb

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by heuristics such as PDF_JAVASCRIPT and PDF_JS. The PDF_METADATA_EVAL_STAGER heuristic indicates that this JavaScript is used to decode and execute a payload from the document's metadata. The use of String.fromCharCode further suggests obfuscation techniques common in malicious PDFs. While no specific family is identified, the method points to a downloader or stager.

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` `6b1ac6f29a2277be7a0070d6c6befa19c311beb91122ab5b9c91b973ecee08c2`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62D0	520 bytes

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