PDF malware analysis — malicious · 493e0ea7f59d1317

MALICIOUS

PDF

3.8 KB

MD5: 023a4124607d518b80931ac85d24f87f SHA-1: 20b50f54793aebc596d1cc5146239f1043f2e83d SHA-256: 493e0ea7f59d13176f643efe436e9e2768280fcbae74ccd078f5a796995b88c3

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and String.fromCharCode for obfuscation. The extracted JavaScript files, particularly 'javascript_obj111712_001.js', are suspicious and likely responsible for executing malicious code. The primary intent appears to be the download and execution of a second-stage payload, though 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_obj111711_000.js` `3228c7c098f3ee437708566a166dee1141d58969c321eac3a3331fa06d2db0e3`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	4791 bytes
`javascript_obj111712_001.js` `b638611884ce57da9c3d8b8b5aaec49c2e5a53548dfd555b69d7256878abdeff`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD52	534 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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