PDF malware analysis — malicious · 921977df9a4eab20

MALICIOUS

PDF

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

MD5: 93d36e9d4afc21eef82015daa6ca1e8f SHA-1: a7f47bfa8f7df63dcf7d5928420f811dcce0c5a5 SHA-256: 921977df9a4eab202f6424d663275370571cc8a8a4322e095a168b1a50413289

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF file contains embedded JavaScript within its metadata, triggered by the 'PDF_METADATA_EVAL_STAGER' heuristic. The use of 'String.fromCharCode' and JavaScript actions suggests an attempt to obfuscate and execute code. This pattern is commonly used to deliver further malicious payloads or conduct phishing attacks. The primary IOC is the file's SHA256 hash.

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` `a4471f3a0a2d54fdc925e973ae9f30387ee882e15f8a9ee1b0aa392e0988da7a`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6315	509 bytes

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