PDF malware analysis — malicious · ff76fa357ed0a56c

MALICIOUS

PDF

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

MD5: 79a61001c671d052b7b794c09dfcaa0a SHA-1: 3058e2e2c3f32a55a1e0b8b83c8003a4d0cce13b SHA-256: ff76fa357ed0a56c448f21d28805e31611658cc217ee2907f58db0d986ceeaaa

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

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 presence of 'String.fromCharCode' further suggests obfuscation techniques are being used to hide the malicious script. The script's likely intent is to download and execute a second-stage 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` `6c50782f0f76de45caae1b60e2bea53bc345afc83228a2295228ecc6c5c9b274`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62AF	512 bytes

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