PDF malware analysis — malicious · 5952250348100f45

MALICIOUS

PDF

7.5 KB

MD5: 76c56038aa609b609eeef9090ff62695 SHA-1: 4a17e229d3fb08ac3dd6b2323fda2f6f4182e78d SHA-256: 5952250348100f4580a256721199e1d12e7f6645654a647b1fd2fc49761811d1

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated JavaScript code is being executed. Two JavaScript files were extracted, which likely contain the malicious logic. The primary function of this script appears to be downloading and executing a second-stage payload, as suggested by the 'Script obfuscation indicators' triage signal.

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_obj0004_000.js` `9902a22019b114722f11c9449513dbc173978df28aaecb1c9519bed8fdaeffa6`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001bce.js` `b22e69898942a7eecac799b0ae2d4febf4495c4a82fbf490c65e63dc56aae59c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1BCE	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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