PDF malware analysis — malicious · 434b5c247d62eb5e

MALICIOUS

PDF

4.0 KB

MD5: 756f125af1a0d2eadd1cf1228fbc1910 SHA-1: 049be9822e7a0aaa9bd6d93591a51b8e33bfb5c9 SHA-256: 434b5c247d62eb5e1b31f440d571abae4945b5a72d32fecb3e7fbe57b7a51acd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests the JavaScript is obfuscated and uses eval() to execute code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious artifacts. The primary attack pattern involves exploiting PDF vulnerabilities to run this script, which is likely designed to download and execute a secondary payload.

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` `24a6e3308eac532e605a604978af983ad9da6418826f0ac7ce5d1598ac852869`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6273 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` `fcbecd5e0266d0b7b21a62cb0342ec98d1b85b9c265ee4565fd4a9c1598bfa23`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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