PDF malware analysis — malicious · bd75a4da4838b1e4

MALICIOUS

PDF

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

MD5: 9399ef15f0cc749e147a1ad7d2cb65e4 SHA-1: 2857f178cbb76e054501b06e705556a6ba54a831 SHA-256: bd75a4da4838b1e43c6a76d0f107909836f4439c2f1828e295a6cdb1e0e463af

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 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' indicates that this JavaScript is likely used as a stager to decode and execute a payload. The use of String.fromCharCode further suggests code obfuscation. While no specific family is identified, the overall pattern points to a downloader or dropper.

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` `d546ca0609bd4be27381342b97d58c5398d415407499b234a94de52c84f6911d`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61A2	451 bytes

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