PDF malware analysis — malicious · b64935f87a3efb9e

MALICIOUS

PDF

4.1 KB

MD5: 1eb3c060a81e5b5c1fe3ae00a3cb9093 SHA-1: 56821657871ae948246915e8a0ae657ae5eefedf SHA-256: b64935f87a3efb9e7d3be1d56f7369e174b50155c126440d49bad6b073f7e57c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

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 arbitrary code. The deobfuscated JavaScript file 'acroform_b64_00.js' was extracted, and its analysis reveals it is designed to download and execute a second-stage payload. The obfuscation and use of eval() are common techniques for evading detection.

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` `da79e01f5b531097fdaede7a1acebe050235c882fb5878912df562cc6f1e6807`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6393 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` `160c9740f856c2bc8406078486744a3048b39655e0a89b4777b1d2145003dd15`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3640 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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