PDF malware analysis — malicious · ece2ac49faa5ad31

MALICIOUS

PDF

4.1 KB

MD5: c20f0597c8283fc1c97c5530ce9a5f0c SHA-1: cc2c6104064beb8191849cc2371652cd89163894 SHA-256: ece2ac49faa5ad315f3687ec600825251310022fb7070f72eae0a1b59d7132ff

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. A critical heuristic identified CVE-2008-2992, suggesting the PDF launcher decodes a numeric character-code string and executes it. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial access. The extracted file hash is included as an IOC.

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)
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. (matched inside decoded stream)
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` `feff89036288991fdf26519d2f3f1b53b63cf45180a8fb041431ccb303611897`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20735 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` `50ddb016891b1b4c65ff8bb797dce2bdf1daa9f4195b4b9c14b91cec832f512f`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6104 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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