PDF malware analysis — malicious · d6e83a2311d7f5dd

MALICIOUS

PDF

4.0 KB

MD5: 8457c65b014157998cc3bd51c5cfad8e SHA-1: 69eaca38250500af6d16724edb1452f863d41dab SHA-256: d6e83a2311d7f5dd790403eefbe0251e7a9f1406ec945088bd4abd93dd382a6e

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The deobfuscated JavaScript stream (acroform_b64_00.js) shows evidence of eval() calls and String.fromCharCode usage, suggesting it's designed to execute obfuscated code. This pattern is commonly used to download and execute a second-stage payload. The presence of suspicious extracted JavaScript files further supports this assessment.

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` `8a03b17046539b2d0c3476384058edabbae4ce02034a9c21989ecdfdc02a2e44`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6333 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` `9e19f74ca6267f4e5090f88999ed565a9ceebd129f717e8cdbb325afde2fac86`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3596 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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