PDF malware analysis — malicious · 1a62cda6c8b6367a

MALICIOUS

PDF

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

MD5: 48ad6a089f831d7ed19f86dc48129525 SHA-1: 140b0fbd77bb8ba2c23ec0a775d2fee98593131d SHA-256: 1a62cda6c8b6367a69d6f6a47b3a347294ca902589a74a68c058fe6004700d7a

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' firing indicates that JavaScript within the PDF's metadata is used to decode and execute code. The 'String.fromCharCode' heuristic further suggests obfuscation techniques are employed. While no specific URLs or second-stage payloads were extracted, the presence of these indicators strongly suggests the file is designed to download and execute further malicious content. The SHA256 hash is included as a primary identifier.

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` `3c338caf3a0e01b09b409544e85a551df2e1437f937975df58d100b2ad9c80e5`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6318	519 bytes

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