PDF malware analysis — malicious · ad0c43b26c4b6a4a

MALICIOUS

PDF

4.0 KB

MD5: 352991e0f0e32b2eb537b96c96e8d97d SHA-1: 05c1c1ed6919c00bcfa62ca50e47223c96c64701 SHA-256: ad0c43b26c4b6a4a9601f249d2bbb1af87a981471cb949195d7d05c348682cf5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

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 code execution and obfuscation. The primary function of the script appears to be downloading and executing a second-stage payload. Due to the obfuscation and lack of specific indicators, the exact family is unknown, but the delivery mechanism is 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` `694e9ed1a2ca1998f74effbe9252c0cc6ec0c9bbe5934d40e9ec74d366135783`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6265 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` `82277cfa258c89c328c4b488e6a3be86a89e2fafde66086c70f8909853287a26`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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