PDF malware analysis — malicious · da9f4ecb1dc3fba5

MALICIOUS

PDF

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

MD5: 6f2726709cf7ab5a8c29b660f18aaea5 SHA-1: 00f6a7538cd59ef834c4a6c2269cfbb5cc45dadc SHA-256: da9f4ecb1dc3fba58444c285c921fbcf887192fe75c539980e0aeac70de50a5f

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 JavaScript stream is obfuscated and uses eval() calls, suggesting it's designed to execute malicious code. The heuristic PDF_FROMCHARCODE further points to obfuscation techniques. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the obfuscated JavaScript. No specific family could be identified.

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` `68717ae376986ef1315ab1de18f13e111725283889e2373c90ef5b07a2e05d3c`	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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