PDF malware analysis — malicious · 1f05b4161f2214ef

MALICIOUS

PDF

4.0 KB

MD5: 91dcadf174d89be41424783cab67c955 SHA-1: b960f063fb1504b2e95f9e82b2b38efae602a3b9 SHA-256: 1f05b4161f2214efb684284a3f279952812efd5f703f7e2cdf355a366fcd82a6

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', likely contains code to download and execute a secondary payload. The presence of eval() and String.fromCharCode() suggests obfuscation techniques commonly used to hide malicious JavaScript. Due to the obfuscation, the exact download URL or execution method could not be definitively determined, hence the 'unknown family' classification.

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` `e9e5acbd8057949102bde9561f55e68121add820e75670b881081a9dfb8286cd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `e69a660150f93bd7b6050c74486dc19bf9a999717b04aed4dc377029cd2f862b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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