PDF malware analysis — malicious · d9c90d5a164e21ed

MALICIOUS

PDF

4.1 KB

MD5: d686a3d336c34923fcaaa86261ca82ae SHA-1: ff79e754dc1c4d34718df7922a4958e2b7d7b15d SHA-256: d9c90d5a164e21ed40688a41c449863222d354a9ea7520e8d266f0712ccde0a6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript, found in acroform_b64_00.js, likely attempts to download and execute a second-stage payload. The presence of eval() and String.fromCharCode suggests code execution and obfuscation techniques common in malicious documents.

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` `c7dace8855a1e5b183a0aee776c377e60354aa6dfcbf4568b383bab69a18a8d4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6477 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` `65e63f77d0ea2947cb7e8572353f36319007deffb9827bc274ebbea9d1d822a6`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3705 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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