PDF malware analysis — malicious · b934c1603b641cfa

MALICIOUS

PDF

28.8 KB Created: 2010-03-12 10:20:15 Authoring application: ZaHTk3yaSe6V (via u8kcW0Et0CP5X)

MD5: b32116bd1921f9bdbed11df921412c14 SHA-1: 4e8002bf58b69b861fd32b970f785f7b21785ed0 SHA-256: b934c1603b641cfa68c0ccade5491f5f3d880c9e1717111acbda666384df9ce7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `eval()` and `String.fromCharCode` for obfuscation, suggesting an attempt to hide malicious code. The heuristic 'Suspicious extracted artifact' also flags obfuscated script content. The primary intent appears to be the execution of this obfuscated script, which is likely designed to download and execute a second-stage 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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `ea0e6f49b6913896c5d733ebdb8278baad45369f6cc81e0da6760efd185aed53`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	28230 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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