PDF malware analysis — malicious · e56b465edc3539db

MALICIOUS

PDF

4.0 KB

MD5: 16c08f04353ecdfcd59211e63e3a9525 SHA-1: 08b50f1f002d7760ea3d59fbe9670cd5d3b8ddff SHA-256: e56b465edc3539db033e9aff4bc42c57f08c649900e3f9d31bea7ab2abf2759b

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, PDF_JS, and PDF_EVAL. The JavaScript streams, particularly 'acroform_b64_00.js', appear to be obfuscated and utilize String.fromCharCode, suggesting an attempt to hide malicious functionality. The primary intent appears to be the execution of this obfuscated JavaScript, which is a common technique for delivering second-stage payloads or exploiting vulnerabilities. Due to the obfuscation, the exact payload or exploit is not immediately clear.

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` `02514fcb1862ea47c1869c6676247ba80d6e50da7c422a5e4d29a354223b72fc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 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` `4f2fa54fecf2c4c1e079b1306b1da5cc2e4b0165e113e3ec234ecc89439fb1be`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3610 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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