PDF malware analysis — malicious · b4546cf3314b10db

MALICIOUS

PDF

4.0 KB

MD5: 1d310e33788b0bf92cf7f7be4d9d2c8a SHA-1: 1a17e3a1b263b7502a38668766d13afb852e0540 SHA-256: b4546cf3314b10db36dc9f5f8e8c5af2491215790b1623173323938b53dc13a6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings, along with the 'Script obfuscation indicators' in the static triage, strongly suggests that the JavaScript is obfuscated and intended to execute arbitrary code. The deobfuscated JavaScript file 'acroform_b64_00.js' is a significant artifact. The primary function of this script appears to be downloading and executing a secondary payload, a common technique for initial access.

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` `0e3fac7246323853284198942bf6a4047d90b6edc80618e323b04e0772c1e1c8`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6265 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` `7a97f3dbed3d7178ca4d263542ca5f530369863c9dcb7593b59d53d1827a34b0`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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