PDF malware analysis — malicious · 325dc4379140f2d4

MALICIOUS

PDF

4.1 KB

MD5: 853c043bf4fa704580fb96e39c658b32 SHA-1: b8b842c88dd12fbff3172596a12adfb367421045 SHA-256: 325dc4379140f2d4c646947bf3d00cefb5c2807f16b05d9b66efc6a5700c3540

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings, along with the presence of deobfuscated JavaScript in 'acroform_b64_00.js', suggest that the script is designed to execute obfuscated code. This obfuscated code likely downloads and executes a second-stage payload, a common technique for malware delivery. The extracted JavaScript files are included as IOCs.

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` `ca3c9a7fe651c13d06132fb5f9e1a07b39528e3be8a4a2a183e1b94de3a8a79d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6361 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` `afbd95446c44c29b4b2bcd391c9e04087ade84c6c2a35dec5f456eb8751ec3dc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3618 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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