PDF malware analysis — malicious · fab00318ec6a6bf4

MALICIOUS

PDF

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

MD5: 3d4e357aeec2084fe6197cb5aa9a1c96 SHA-1: 97b3a0f2535d87da1609a3837e362bbef5160efc SHA-256: fab00318ec6a6bf45c0973695024a4b8718819f8041bcf026ff101e86fd73300

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

This PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE. The JavaScript stream, named javascript_obj0001_000.js, was found to contain an eval() call, a high-severity finding. This suggests the script is likely obfuscated and designed to execute arbitrary code, potentially downloading a second-stage payload. The use of String.fromCharCode further supports the obfuscation technique.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `d7991b6c901adec1c870d18ae486c147f6a7422dea3616a589d11a6ad7546105`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	933 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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