PDF malware analysis — malicious · 580f731b66cbf99d

MALICIOUS

PDF

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

MD5: 597d4f2a54e3e5ccc4e850c895917ee0 SHA-1: 2eb37170895be71060f959486d194431096a39c4 SHA-256: 580f731b66cbf99d752e705526a43b19d41744fe4db530c1f3c7293e6dd28794

64 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a payload from the PDF's metadata. The use of 'String.fromCharCode' further supports the obfuscation and dynamic execution of code. While no specific family is identified, the technique suggests a downloader or initial access mechanism.

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` `044b0891173af4da751d60039d4a67b51edc7a8d458c960b3549de95d602369a`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62CD	532 bytes

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