PDF malware analysis — malicious · 38339264390954c7

MALICIOUS

PDF

4.1 KB

MD5: 08bf3b5c97a7bb1ab9d5b2bff13b5712 SHA-1: a6b62b58542107884e1a81c36a8f3e3166ab483c SHA-256: 38339264390954c7d5148f96847157de273582d859e3dc16618ce700d65ef297

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute its code. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted. The primary function of this script appears to be downloading and executing a second-stage payload, although the exact URL is not directly visible in the provided evidence. The presence of obfuscated JavaScript and the likely execution of a secondary payload points to a malicious document designed for initial access.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `43260863b689a2ec48cc646ffae1dbc4d471cd65e65eabae87c2dc82dbe9e4ae`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6417 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `2493807e0df53248d9d7f3b554fa867268c32d26be908699bdf018a6b9413d3d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3659 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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