PDF malware analysis — malicious · fd368dc88dfb136a

MALICIOUS

PDF

4.0 KB

MD5: 3d3c6eb9dcec4de4f46e45c513fafe2d SHA-1: 757f762ae3e6979f5a2d94de57fd77e27a3d1c3c SHA-256: fd368dc88dfb136a4e84ca71e2df12a4737c31a290c16b95edb6893c459822c1

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 and PDF_JS. The high-confidence PDF_EVAL firing, along with the presence of obfuscated JavaScript streams (acroform_b64_00.js and javascript_obj0013_001.js), strongly suggests that the script is designed to execute arbitrary code. The obfuscation and use of eval() point towards a downloader or exploit execution mechanism. The extracted JavaScript files themselves are the primary 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` `120c68687eedfbad4602de23ba3df4dbb1e0a0c68a45794a46d79e4ef3f14708`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6345 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` `f0773a541a482cd5ff782fa29d79fe31b11a91d017418f0fc7826ff72535d3e6`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3604 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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