PDF malware analysis — malicious · c12d98ad4648f84c

MALICIOUS

PDF

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

MD5: 7241d60d8ad459263beb11bfcc3a3633 SHA-1: cef366377860d062955d53cbddf7e8385198fea0 SHA-256: c12d98ad4648f84c98ee870be8989dd06138a3a719fe36f039c821cf0f0a932d

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. The 'PDF_METADATA_EVAL_STAGER' heuristic specifically indicates that the JavaScript in the metadata is used to decode and execute a payload. The 'String.fromCharCode' function is used, suggesting obfuscation to hide the actual malicious code. No specific family could be identified, and no external URLs or hashes were extracted.

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` `e6dddf82d60da15ea683c3252504fb5161970643b9becacc12d150e594024918`	pdf-javascript-stream	PDF /JS object 1 at offset 0x619E	523 bytes

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