PDF malware analysis — malicious · 7a388a1067feb4f3

MALICIOUS

PDF

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

MD5: 74abf64df002bd961cc29383c5f6d6c9 SHA-1: 7f409f930b048231fb1f88000d311574e2a9979a SHA-256: 7a388a1067feb4f3efe2662c57aae1c3a6bc1714b5e38b42e447a3e201668c7e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. Specifically, the 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF's metadata is used to decode and execute a stager. The 'String.fromCharCode' heuristic further suggests obfuscation techniques are employed within the JavaScript. No document body text was available for analysis, but the presence of these JavaScript-related heuristics strongly suggests the PDF is designed to download and execute a secondary payload.

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` `9a28db1b1abeb20a1aa4a89ae4011108e5bdee5e2395785cf64752ca2b9e7173`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6283	458 bytes

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