PDF malware analysis — malicious · 9704e4ee0df5260d

MALICIOUS

PDF

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

MD5: 548f3069df914c5ca81b1c2501a3ba1e SHA-1: 93826fff34919b2a1c2113364dc4b2485563595d SHA-256: 9704e4ee0df5260dfc87d28e264af88730f23f1228ce38cd8a1034b67cbe7da9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, named 'javascript_obj0001_000.js', is obfuscated and uses String.fromCharCode and eval(), suggesting it's designed to execute malicious code. The primary function appears to be downloading and executing a second-stage payload, as evidenced by the high-confidence PDF_EVAL heuristic and the presence of obfuscated JavaScript.

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` `b231382b55e009575377d2c8f32a7b13db340f787e35037c8049dcf19e9d7fa3`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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