PDF malware analysis — malicious · 869844bc47d2fd33

MALICIOUS

PDF

19.8 KB Created: 2010-03-16 16:18:40 Authoring application: qr2wU9z7 (via WU6xHdQlLi6)

MD5: 83d8e89423e64201a96b1eb0bbb6ea2c SHA-1: e89cff234288681abb0dabc99422920bdfbccd15 SHA-256: 869844bc47d2fd33aa024624bd991a6422f681a4cc2df1d85568b364d9aed185

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The script utilizes `eval()` and `String.fromCharCode` for obfuscation, suggesting an attempt to hide malicious code. The primary heuristic firing is `PDF_EVAL`, which is a strong indicator of malicious intent. The extracted artifact `javascript_obj0007_000.js` is also suspicious. The script likely downloads and executes a second-stage payload, but its exact function is obscured.

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_obj0007_000.js` `efc9de54185abbc4b67482919afebfed680cd1a8d087265a4f42e143b03ceffd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23A	19087 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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