PDF malware analysis — malicious · c62df2bf43dc38a5

MALICIOUS

PDF

3.9 KB

MD5: 8432b0a42583f533b7a585731656f086 SHA-1: 0102308272f3b3ac11b89d8eabbc24df91d8991d SHA-256: c62df2bf43dc38a55a1f1a8bf234f10be8f674900590372a6bed949193bcaa0a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document 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 designed to download and execute a second-stage payload. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscation techniques were used to hide the malicious script's true functionality.

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` `b22235c793851f3c179617d4b52ba3df35a59adbad8f6a77cebe8419948e4bf9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6293 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` `58ce517d2359eb72ce9a05a5552aba031194282c5dca276de074b7c2e5b72927`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3565 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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