PDF malware analysis — malicious · 854f7a6af6e79330

MALICIOUS

PDF

4.0 KB

MD5: 34a6dceb761aef4655c62a530a9a9d51 SHA-1: e986b4e87870eaa82988f36fef022be261c826e0 SHA-256: 854f7a6af6e793300495ee9233ba89802bfae69ca76b8ce60df8058fa3606bb9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

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) suggests the script is designed to download and execute a second-stage payload. The presence of eval() and String.fromCharCode() calls points to code obfuscation techniques commonly used to hide malicious intent. The extracted file names also suggest JavaScript artifacts.

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` `4f74a454346d547c4e0ec8761b97a6fd4366054eeafb86b6fd5c42148e5a7240`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 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` `5a23c44191d78679baa5a0ce3923391e6fa25c0ba942613674e8637dc5158262`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3575 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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