PDF malware analysis — malicious · b2ff54d212e2c2ab

MALICIOUS

PDF

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

MD5: c1349d3e03a3e72e409578f846beaf20 SHA-1: e1ee2653340fe1caab97c8840626b95774e91358 SHA-256: b2ff54d212e2c2ab4606b37dcee2d732945e32499263cf4e69e26a54d266dcf9

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by heuristics such as PDF_JAVASCRIPT and PDF_JS. The PDF_METADATA_EVAL_STAGER heuristic indicates that JavaScript is used within the PDF's metadata to decode and execute code. The presence of String.fromCharCode further suggests obfuscation techniques common in malicious PDFs. While no specific URLs or hashes were extracted, the overall pattern points to a downloader or stager mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `20fae1156a5a1c4c88780e509cc53d5ffe7e93e40742e514e72ad22af3d0dd72`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6181	530 bytes

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