PDF malware analysis — malicious · b3538104635dd322

MALICIOUS

PDF

5.1 KB

MD5: 41814faaf46b314d336fb0f0305ed605 SHA-1: c4d74170363d3b08dfa6183a519dfd8df8129f28 SHA-256: b3538104635dd322ce90c784758c4d8a0c9e2e3a98bb0b87ab62e693f260df1a

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 stream, named 'javascript_obj2305_000.js', appears to be obfuscated and uses eval() and String.fromCharCode(), suggesting it is intended to download and execute a second-stage payload. The exact nature of the payload cannot be determined due to obfuscation, leading to a moderate confidence score.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj2305_000.js` `902a32b6b96a277e38c3bd3f077277d421a777723c6a2003cd583b65c983ba68`	pdf-javascript-stream	PDF /JS object 2305 at offset 0x137	8344 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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