PDF malware analysis — malicious · d6103220feb0b3c7

MALICIOUS

PDF

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

MD5: 9cd746b58bf67a1d1bf4f8998ee7d518 SHA-1: 061dcc4bc8066347804da33b89d8f04cf1945567 SHA-256: d6103220feb0b3c777eac84f6f8a5484f93da397435517f48ca9f1780dec9068

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript within its metadata, which is a common technique for obfuscating malicious code. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is likely used to decode and execute a secondary payload. The use of 'String.fromCharCode' further supports the obfuscation technique. While no specific family is identified, the overall pattern suggests a downloader or stager designed to execute arbitrary code.

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` `4d88e914991afa2f26ecf50a44dfb438b6a7c98219504b21260639252517b785`	pdf-javascript-stream	PDF /JS object 1 at offset 0x627A	468 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.