PDF malware analysis — malicious · 99b1de3adbb87500

MALICIOUS

PDF

2.7 KB

MD5: cf8ac876b9a7e9235a088be1ec7371a1 SHA-1: 695da645dc6b52027b602b56fecb2c9bad9c8502 SHA-256: 99b1de3adbb875003db5e79716da544f8ceb52af2c5d443c800b7fe759f4ab84

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious Use of Legitimate Tool: Malicious Use of Built-in File Format Features

The PDF contains embedded JavaScript streams, with one stream exhibiting `eval()` and `String.fromCharCode()` calls, indicating obfuscated code execution. The presence of these JavaScript actions strongly suggests the PDF is designed to download and execute a secondary payload. The heuristics indicate script obfuscation, and the extracted JavaScript files are the primary artifacts. The exact nature of the payload cannot be determined without further dynamic analysis.

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_obj111711_000.js` `8705a6b607ae52fab2b47eb2b53d05ce5e90e21e0c1675da812a181ec76e977f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	373 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `231a5b589bcbc902e48cbfe5864fcdff8beed8bc9f6cf2fc7279b80443239dc6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x249	3024 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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