PDF malware analysis — malicious · 9852ca4c2c95d66d

MALICIOUS

PDF

5.1 KB

MD5: 65257e26a1dd5f5ca4630ca80d123e86 SHA-1: 72dc68592450f79e4dacd1252229a158b07704b0 SHA-256: 9852ca4c2c95d66ddbad0fced782703755ec9b73c0059de58cc3dd69ba72b911

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. This pattern is commonly used to download and execute a second-stage payload. The extracted artifact 'javascript_obj1946_000.js' is also flagged as suspicious due to script obfuscation. While the exact payload is not discernible from static analysis alone, the techniques employed point towards a downloader or dropper functionality.

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. (matched inside decoded stream)
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_obj1946_000.js` `48f7ed855e9646054949dae546344235bc5566774227d0619fc4e7da2906d67d`	pdf-javascript-stream	PDF /JS object 1946 at offset 0x132	8364 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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