PDF malware analysis — malicious · 2d673fc72ff3dbbd

MALICIOUS

PDF

4.0 KB

MD5: 9ea1504409df1501b2d424b88d9b5b77 SHA-1: 396519809a33030259243581b80baa44095aede8 SHA-256: 2d673fc72ff3dbbda5d6d36496cbc10475fbe230e43132ca9ece15106278e553

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious JavaScript

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 filenames 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are included as IOCs.

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` `84826ec4a6986de198a4ccbe035d17c58a090ac31e2cdb57327f9cdf5c60684e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6281 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` `015246264f0309d64b24e3a748c31b792fe4b7af049187e0ffbc29773b3c0e33`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3558 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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