PDF malware analysis — malicious · 31b3cd8334a2f230

MALICIOUS

PDF

4.1 KB

MD5: 5614b938363b431fe1003bf4515f8033 SHA-1: 1c1427e14b25e9271f3bfbe37f5b73571a3b4f13 SHA-256: 31b3cd8334a2f23042a503f15ce563a4e0783b3e959f87de9672cd47f7509497

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 JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a second-stage payload. The high confidence is due to the clear presence and obfuscation of JavaScript within the PDF.

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` `b5ac8c83c8c5ec1b42b50e4ecfd1a78f0d4645c0ea716abeb2f99b57b77ce526`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6261 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` `cb03664d2ea485b9d456f8ae3c4db46d937032e4f21abf46d3b7f7173ce4e093`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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