PDF malware analysis — malicious · cc31485ae49ef05f

MALICIOUS

PDF

47.8 KB

MD5: cba2fc85df748ff181d97b51c9a77e7f SHA-1: 6e357299282b39abad4da451fc31423b410cd631 SHA-256: cc31485ae49ef05ff9b2c50eb3b7c6660710c9d31c9952d8f63f05d1781309c5

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'eval()' call and 'String.fromCharCode' usage are common techniques for obfuscating malicious JavaScript. The embedded JavaScript streams, particularly 'javascript_obj0005_000.js', are highly suspicious and likely responsible for executing the malicious payload. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further confirms the malicious nature of the file.

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` `053a9bd10d1660367ed882f7f4419ef3a307c4d333a9baebf9ce94f303bee166`	pdf-javascript-stream	PDF /JS object 5 at offset 0x162	48320 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `e9cf889ea505dc9e516149945cc85a9a0a7bf9c9fb03e517b0a40b5db97548c2`	pdf-javascript-stream	PDF /JS object 5 at offset 0x162	59 bytes

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