PDF malware analysis — malicious · c882b453787e59c6

MALICIOUS

PDF

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

MD5: 8902d8ee66e3ebee0492cc6b31fb16e9 SHA-1: 345ce50e8e554edc76488efeaeaf59ac7a883d9e SHA-256: c882b453787e59c6ae0f7e19fc5200d9f607e2aa69010f39e8ce8f691a0b6e03

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains JavaScript embedded within its metadata, which is a common technique for obfuscating malicious code. The heuristic 'PDF_METADATA_EVAL_STAGER' specifically indicates that the metadata is being used to decode and execute a stager. The presence of 'String.fromCharCode' further supports the use of JavaScript for dynamic code construction and execution. While no specific family is identified, the overall pattern 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` `ce1f8375aaa786e2b8ccbb30b756706d8b5d089af26e584f800651a0003e8807`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6294	520 bytes

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