PDF malware analysis — malicious · 5153a8e0ac3b6cfe

MALICIOUS

PDF

4.1 KB

MD5: 03332c932f496b37e95709d07eef4068 SHA-1: 2cfe77c4968fa2d10226f723e581d114f4fc1dae SHA-256: 5153a8e0ac3b6cfea35c8d0456628704e296bd78c3d3772622e0455f5c6a98e3

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The presence of a PDF_EVAL rule firing suggests that the JavaScript code is being executed dynamically, likely to deobfuscate and run a malicious payload. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are suspicious due to their size and obfuscation indicators. The script's intent is likely to download and execute a second-stage payload, but the exact mechanism is obscured.

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` `a507964ce47f41c52e85116c67066e345550b74930b47b8544c5a23189c6f120`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6361 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` `6073d504882a6dea0404c2807abb29906a9b39bae7388857230614e386c7e82e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3617 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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