PDF malware analysis — malicious · 319967987aa1fe31

MALICIOUS

PDF

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

MD5: 4fb1525e1ef2dd66c3fad9d7140f3fdb SHA-1: 210d8faadc9a179d553074c8e1a82274cb00756b SHA-256: 319967987aa1fe315d0273a61341353871c9c4892ffd51f5b5eedcc10fa2972b

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: 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 likely responsible for executing malicious code. The use of String.fromCharCode and eval() suggests obfuscation, making it difficult to determine the exact payload without further dynamic analysis. The overall attack pattern is a malicious PDF leveraging JavaScript to deliver a payload.

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` `fc0310ad61ddac72198b99179e6fccceccb1ae553dc6e485ccc90e7be1909af8`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	862 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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