PDF malware analysis — malicious · 8f901c9f5c311776

MALICIOUS

PDF

4.0 KB

MD5: 6d8c5792028e739b4614069b10db866f SHA-1: 54face2bf6a8c8ea48be6ed0f5abd2d2934864fe SHA-256: 8f901c9f5c3117769916d411fc5ff28333be89c61008c9ddfc03cf92e33ec86e

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 and PDF_JS. The high-severity PDF_EVAL firing suggests the JavaScript is actively executing code, and the presence of 'eval()' and 'String.fromCharCode' points to obfuscation techniques. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a secondary payload, which is a common technique for 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_obj0013_001.js` `2bd32d1c8c6285d2eaa52a3fe62a79793ac7b88356cde8a35e27d0601feb3715`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6257 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` `a0df968f1c12c68bb296a9a232e65ca9827c2bad5f4984d8c6ee432a011e0db2`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3539 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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