PDF malware analysis — malicious · a8f8e61d2401f97a

MALICIOUS

PDF

4.0 KB

MD5: 30b818e817f90a5309e231931bf5eaa3 SHA-1: 4cf68ed28a88d881f7f6f87d7ee67a9e4594b4af SHA-256: a8f8e61d2401f97a47c22194d37fd54d6a70a4f2507e785519629bd1a5462620

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream appears to be obfuscated and utilizes eval() and String.fromCharCode(), suggesting an attempt to download and execute a second-stage payload. The extracted file 'acroform_b64_00.js' is noted as a deobfuscated JS stream, further supporting the malicious intent.

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` `5dbe1f4be40ca32d5f1c70eb469c8c31884fc8a6179ac94aa9ea3696540a1469`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6297 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` `90f7ba51e30d2466005a7e463ed851fd87d601c7e681e556897aed087a982b46`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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