PDF malware analysis — malicious · ca2a5b3376dc374d

MALICIOUS

PDF

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

MD5: 90b67eda2ead156fa8bbacdd8458f959 SHA-1: 202355db20d3699c974fcc83479b33d7cf92b3f0 SHA-256: ca2a5b3376dc374d8e7fe53712242cf6337f438d3b228d1c62f51033d9d36f4f

64 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The 'String.fromCharCode' usage suggests obfuscation. The primary function of the embedded JavaScript appears to be acting as a stager, likely to download and execute a second-stage payload. The document body is minimal and does not provide further context on the lure.

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` `30146c2c6dbd5be335a8b48c0494f7c662cf2cec84bedff0af080237c3026123`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62E4	532 bytes

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