PDF malware analysis — malicious · fac9e31aee5ebd0a

MALICIOUS

PDF

4.0 KB

MD5: ac9e0074829895c4f32458c6d9e8798b SHA-1: bb4b8e83bab9c288326f821c211d69effe340c47 SHA-256: fac9e31aee5ebd0a263e3e84ec5107dddb30ee0e552ce276198b19af1eb79ca2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream, 'acroform_b64_00.js', likely contains code to download and execute a second-stage payload. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscation techniques are used to hide the malicious script's true intent. The extracted JavaScript files are the primary indicators of compromise.

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` `5fdb703b3b4e1654812f5e20d75ffa3c87aa4a338f073fa224d78a3722ae55e8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6269 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` `fc9abf76a9620cb2bbb143524f1a5f9a45c73494363fe97234a01c299d4f0800`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3547 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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