PDF malware analysis — malicious · 7c453146547c9faf

MALICIOUS

PDF

4.0 KB

MD5: 5b5a4fdfe43d3f48d26c3c8cabf78d12 SHA-1: 14f2bb5ae4b9b812dae153c2d423feb60126435f SHA-256: 7c453146547c9fafeaa0834b8efc1a746b5f9e691be4e22e8cd35973f5d52c06

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation and dynamic code execution. The deobfuscated JavaScript file 'acroform_b64_00.js' is likely responsible for downloading and executing a second-stage payload. The presence of these elements strongly suggests a malicious intent, typical of PDF-based malware delivery.

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` `6361131271874de5c376d4545f63ae489f0d13d70b404a78d1cd30ca888d97ce`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6253 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` `4acf138b9ba2897be61f85048b45ac07f518cd0cdbbc95eec0cad622f9d4aec0`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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