PDF malware analysis — malicious · bca80b8810290db3

MALICIOUS

PDF

4.1 KB

MD5: 66d9414ff1fb3f810b3e2b66b1dd6c9b SHA-1: 59ccc0e0b9d133ec810d4c74ea527469588255da SHA-256: bca80b8810290db3d6bc4af52d437c5d873be5e99ebd58878af607bae3eb5ffd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests code obfuscation. The extracted JavaScript files, particularly 'acroform_b64_00.js', are likely responsible for executing the malicious payload. The obfuscation and use of JavaScript within a PDF point towards a downloader or initial access mechanism.

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` `2b30d02c1c0c87abf5f2145ef456c469b013c4289b8baf3b3d2acb7da7689917`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6369 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` `14257fa33598ff0b62625d7cf034a237f2203ec62f03af0deffaf0f19d408c5c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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