PDF malware analysis — malicious · 38629f6a541ca59f

MALICIOUS

PDF

4.4 KB

MD5: 5750164ebb1cc8e638467bfc06d28da9 SHA-1: 74a4e9ea01f92d0fa7efc5b8a5b1f51214840edf SHA-256: 38629f6a541ca59f5957f66b29f94dbdf1d630ba73d81fb551e2fdcb21fe9c5f

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF exploits CVE-2008-2992 by leveraging embedded JavaScript, which is further obfuscated and decoded. The `eval()` function and `String.fromCharCode` are used to execute the malicious script, indicating a likely downloader or dropper functionality. The script is heavily obfuscated, making it difficult to determine its exact payload, but the exploit itself is the primary indicator of malicious intent.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `0a6a84c9c592de0d0aa14e65c09437c83c6a395b8064482c1295c311b1a93d3f`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `3e25b229b0ffa4fe2cef4152d898c3e34926361849f93729af3345dd3cc76cfa`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6877 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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