PDF malware analysis — malicious · b85dc44f3e04e298

MALICIOUS

PDF

2.8 KB

MD5: b1f9f37812853c59de911a991b712ee0 SHA-1: 9fb770891a7131ca5d0c46bb4a4e0e2062f4b597 SHA-256: b85dc44f3e04e2984e73b6223edc8e60e8a09c5455c9644c853015519532a1ef

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, one of which utilizes an eval() call and String.fromCharCode, indicating obfuscated code execution. The presence of these elements suggests the script is designed to download and execute a secondary payload. The obfuscation and lack of clear document content make it difficult to determine the exact family, but the techniques used are common in malware delivery.

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_obj111611_000.js` `819d9c021913a5db2b67c6f4f5fa4de5a2f66470c9f24d98536a07d2618df7ea`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `e26a19933b512052f477220994b7478e2cb7e3d57d168089d2ed342f0b0b2620`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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