PDF malware analysis — malicious · 96f1deb9cbf1589b

MALICIOUS

PDF

4.1 KB

MD5: 8176af61c3cc26e3ff6845ca1e0dcd5d SHA-1: d80debefe9f0c9990355534a3ecabe61301caf13 SHA-256: 96f1deb9cbf1589ba4ba0bff85cf3b1de7102961203e3755a0b1154d92d98c84

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscated code execution. Two JavaScript files were extracted, one of which was deobfuscated. The deobfuscated script likely downloads and executes a second-stage payload, which is a common technique for malware delivery. The confidence is high due to the clear indicators of obfuscated JavaScript execution within the PDF.

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` `2b29aa3dc0125f18e09d8f9087fa72fd9bb12ba9b86c1de4bc2cee907c5bbf6a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6377 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` `a380db1510393b1a59525b68afb354884c59f4ccf9f3869aa355cacf6bac7e92`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3629 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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