PDF malware analysis — malicious · af81f69125323541

MALICIOUS

PDF

4.0 KB

MD5: 7faf407bbd22c838f5b3a9aa88d946bf SHA-1: 29b86aa4a53fff36170fcf04e353a021ca0bc27b SHA-256: af81f69125323541a8fc2311a1879e27ccd7f33e80b80117c3e4a0aa65dadc7c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The presence of 'acroform_b64_00.js' and 'javascript_obj0013_001.js' as extracted artifacts further supports this. The script's likely intent is to download and execute a second-stage payload, which is a common technique for malware delivery.

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` `e3564415028df11cacf684ddf8c2fd459d59f528db7e29500ab5ef671cabd7d7`	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` `362b0f27aa27af98f7e5d327f4329e3db11eb5599ad57b214f040347c63c9a46`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3545 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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