PDF malware analysis — malicious · 9c2adbfff64be62c

MALICIOUS

PDF

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

MD5: 3a8b142b3da84a7c18a97147ee531fe2 SHA-1: 7f0016b5cab0e4eeb0a234891cac1099c7faa945 SHA-256: 9c2adbfff64be62c1c644e94f84e600e93a53685bcd1157d24832368a533654f

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 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 common in JavaScript-based PDF malware. No specific family could be identified, but the technique points to a downloader or stager.

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` `50538e09eb74cfc9549da17627de0c4f706864417fd577e167f8e59c014e6126`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61D8	467 bytes

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