PDF malware analysis — malicious · 7c1f351f64e8ef06

MALICIOUS

PDF

4.0 KB

MD5: 0ab25dbdc6bdbbe164dd18bc836fb55e SHA-1: 887e5aa8e6cd1afa5c626819dd3952d66da08448 SHA-256: 7c1f351f64e8ef06812932a825a7f22a5df7079086c9744c8ce2f19ac2afe547

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings suggests that the JavaScript is obfuscated and likely uses eval() to execute code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious artifacts. The primary attack pattern involves leveraging these embedded scripts to perform malicious actions, likely downloading and executing a second-stage payload.

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` `3ceea34490a0cd4079e43c910dfb2bf15474b11f0952fb7a27a141ce561fadc6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6165 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` `6a870917c547f33ce6220e082a2a429b03545f6bbf6e20fb7c8977118acb7ace`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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