PDF malware analysis — malicious · ac9e4d3d1a1c87a4

MALICIOUS

PDF

4.2 KB

MD5: 31e343cb21af3b8ba73431872912dc27 SHA-1: 774748ce502ce1086104c65b3b8291f2e5e8ca67 SHA-256: ac9e4d3d1a1c87a4f1eeb4419306790cde4f1aa428dd80b23a427e35e5360b55

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 obfuscated code execution. The critical CVE-2008-2992 heuristic confirms the use of util.printf to decode a numeric character-code string, which is then evaluated. This suggests the PDF is designed to download and execute a second-stage payload. No specific family could be identified.

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` `4ff28cb4a884edb920a8860ec0448dd15ea238823e84149f5d00342e9376b50a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20172 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` `b04c3255a76b9fadd99300db7fcfd7ba80144566a7932ec32afbdf60365570dc`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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