PDF malware analysis — malicious · ad18cf815d40fa68

MALICIOUS

PDF

2.5 KB

MD5: 7c8b04669be351a47f1af589d69791ce SHA-1: 4da400537d5e663017853a5abdec6a5b78994ac7 SHA-256: ad18cf815d40fa688fd13a4b2f4aadb7807e53d7bf3d72d03b58c6c7598839e6

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, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage suggest obfuscated code execution. Two JavaScript files were extracted, which likely contain the malicious logic. The primary function of these scripts appears to be downloading and executing a second-stage payload, though the exact nature of the payload cannot be determined from the provided evidence. The lack of specific IOCs like URLs or network indicators limits further analysis of the payload.

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` `4fcc44b2170bdff0da11c7788737ab826a7098f08f2e2bd906e2d22b6c20a7f7`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `1322352b0f406e2b0362c397dbc731680b71874ef7cb56f939f8ab751905f71f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x248	2965 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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