PDF malware analysis — malicious · a0ddf0a3a1a3f307

MALICIOUS

PDF

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

MD5: fedd298a3a2ae7c5087c73f8e760bcc4 SHA-1: 651cd3e6b6f4983ef63a033a0b85586246e0a338 SHA-256: a0ddf0a3a1a3f3072d9ccab09ba5d58f9957414065ebdd9830aa1e94c4bef0d5

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains JavaScript embedded within its metadata, triggered by the 'PDF_METADATA_EVAL_STAGER' heuristic. The use of 'String.fromCharCode' suggests obfuscation techniques common in JavaScript-based PDF malware. The embedded JavaScript is likely responsible for decoding and executing a second-stage payload, although the specific payload and its actions could not be determined from the available evidence. The confidence is moderate due to the obfuscation and lack of a clear second-stage indicator.

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` `7dd1d722d9e3cd24b5db0f1dbcdf113459c9a2bba903f513d6756f205fcea0ba`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62AC	525 bytes

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