PDF malware analysis — malicious · c78f429804db9ac0

MALICIOUS

PDF

4.1 KB

MD5: 07846017718daa3173410975ce119ab5 SHA-1: 67424a4583c9102860ffc5ebd99dcea89308cab5 SHA-256: c78f429804db9ac039e69897f95bac4dfd05676ec09b4c8f81eb618d4444ea5d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, specifically the 'acroform_b64_00.js' artifact, utilizes eval() and String.fromCharCode, suggesting obfuscation to hide its malicious intent. The primary function of this script appears to be downloading and executing a second-stage payload. The presence of obfuscated JavaScript and the likely download functionality points to a common malware delivery technique.

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` `43348fb1553c8e66d94233ab40faca64aa613d224abb66f006693f0eb28d5559`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6373 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` `fc14de867031fba1ef9d585967ca6eef5898ace7d7bb3cb8e4c6a23e5f6f3f10`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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