PDF malware analysis — malicious · 3644d6a5d3633e58

MALICIOUS

PDF

4.1 KB

MD5: b91afa9b31fe58b07c89ed242a87c9e4 SHA-1: 7de3ff16c81e747e38b0a32f7771f8d294c5fdc9 SHA-256: 3644d6a5d3633e58cd57b54145508ed4bc251d92d4009b6ed224de330eba9d7d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream, 'acroform_b64_00.js', suggests the script is designed to execute arbitrary code. The presence of 'eval()' and 'String.fromCharCode' further supports the interpretation that the script is obfuscated and intended to perform malicious actions, likely downloading and executing a secondary payload. The extracted JavaScript files are the primary indicators of compromise.

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` `0e478c3b1083bc7e6ab1f68040d157c3e71fb172553c8596fe36fa300bf1826b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6405 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` `78a338ff3b42547216043ce1e2eec0c35278b72f71c6ce7e911d590905a146ac`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3651 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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