PDF malware analysis — malicious · 1ccb8b9631f4def7

MALICIOUS

PDF

18.1 KB Created: 2010-03-06 14:18:19 Authoring application: vHOHC7cvk (via jBPB6Z)

MD5: 8311a2060ef634a7e0624abf1db4060a SHA-1: 7bbd42638caa8727269f35fb7f22580e7bac95ac SHA-256: 1ccb8b9631f4def7c45e7eb43e82cc09e4ab2dcb44b384c67d6e8e1ab6c266d7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing String.fromCharCode and eval() calls, which are common techniques for hiding malicious code. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the obfuscation and the presence of an extracted JavaScript file. The specific JavaScript file name 'javascript_obj0007_000.js' is included as an IOC.

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` `1d754d7ec1ffb3620c8071b288bedc5643af3f2ed491a8bddd75188f0615954d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	17283 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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