PDF / .INF malware analysis — malicious · ff19321c4936fafe

MALICIOUS

PDF / .INF

45.6 KB

MD5: a28087349d9353c9874b111038e5f8ec SHA-1: 9c53e467fb689b19991307405feca48bb3a19206 SHA-256: ff19321c4936fafea4193e721e3ece589e6c161122c96f3c120c9e9df853cd7d

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The primary embedded JavaScript object, 'javascript_obj0005_000.js', is heavily obfuscated and appears to be designed to download and execute a second-stage payload. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature of the file. Due to the obfuscation, the exact download URL or execution method could not be definitively determined.

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0005_000.js` `4b202b779a01099daaddb8e755245f15da41126544e7100b096bead17f9837c9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x160	46068 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `eff6331cc8a63acb185f1dafd5a6d536f4dc3a15ff0508f9f3c1499dfbda7e90`	pdf-javascript-stream	PDF /JS object 5 at offset 0x160	65 bytes

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