PDF malware analysis — malicious · cd88e8d423a60c52

MALICIOUS

PDF

4.3 KB

MD5: 1200f1659da316ef20edddeb90c9f68d SHA-1: ba1b3524a765b7f1600cd46de1de4e1ad81c8ca8 SHA-256: cd88e8d423a60c52a17dc78fa543759fc5eab8f35c448291b68d47891b1560c8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and utilizes eval() and String.fromCharCode() functions. The critical CVE-2008-2992 heuristic indicates that the PDF launcher concatenates info fields, extracts characters at a fixed stride, and evaluates the result. This suggests the script is designed to download and execute a second-stage payload. No specific family could be identified due to the obfuscation.

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` `b674a58d4c24902e4aa02e5545b51fc8d2546559c906b405bcb11572efe84042`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22990 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` `1c5e21e19cb5bd63bff62fe81aca7c98c8318eb32a5bd93d56481eea196f92fe`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6775 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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