PDF malware analysis — malicious · 9391aab1e771b742

MALICIOUS

PDF

4.0 KB

MD5: b73f92ce6f364463935c84cbbdc78022 SHA-1: 7751809c1203190d2377537f8ed60efc2abad43e SHA-256: 9391aab1e771b74290e48f946bb1e00cb4a6cdfc229b2806dd1187c40b08d80b

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE rules, along with the deobfuscated JavaScript artifact 'acroform_b64_00.js', suggests the script is designed to execute arbitrary code. This execution likely involves downloading and running a second-stage payload, a common technique for malware delivery. The confidence is high due to the clear indicators of obfuscated JavaScript execution 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` `d5f7cbeba31f7120c0628e7232f00d3e8d6ab17c15656a819e4f6d7d8b1af934`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6297 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` `29dd9ede3f0d3b2e87b3ca3b4f1499d14f5bc22068e6f826363def35ba1e66c1`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3568 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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