PDF malware analysis — malicious · e5f9ff3902d93d61

MALICIOUS

PDF

4.0 KB

MD5: 545f0fbd08f8c8262cd3081587660d03 SHA-1: a2884d33e3ce4d8c0f76bf3b331c8910c89a5454 SHA-256: e5f9ff3902d93d610af12b916639fceea14dbd455b9c7c90ed3d1fdd8e7a37ec

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode(), suggesting obfuscation to hide its malicious intent. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a secondary payload. The high confidence is due to the clear presence of obfuscated JavaScript designed for payload 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` `eb0d6e081d5216229c3290d91324562738b16771e5c8006c4a130eabdfa930f7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `dbe23266ba17cfefae14cf4d583374730157150551929554c7324eaf28485e10`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3599 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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