PDF malware analysis — malicious · 9c43c0641032e229

MALICIOUS

PDF

4.4 KB

MD5: 0c6f6a92a679b341b8510f89ea610846 SHA-1: 3828b891ff4780d9c836ba267bc86ff256928e00 SHA-256: 9c43c0641032e229466afb900821d864f4dfb7cc635f855bf49bf115dd358288

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability. The JavaScript is obfuscated using `eval()` and `String.fromCharCode()`, and further deobfuscated into a second stage script. This second stage script is also heavily obfuscated, making its exact actions difficult to determine without further dynamic analysis, but it is highly likely to download and execute a second-stage payload. The primary attack vector is the exploitation of a known PDF vulnerability.

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` `de2d50f5323ec1d980971ba61def8122e0c14dd171b52151b75bb70065812591`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23158 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` `15844b75338a4e440c795c4707bd4722aa902433c492fde3a848953f0c91ee82`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6815 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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