PDF malware analysis — malicious · d0d41aa633d8904b

MALICIOUS

PDF

4.3 KB

MD5: 26b1e8555fe5cd790c76b678291cdc2c SHA-1: 1f5f12c5aa166274304e4d80226315d0b5cfcf1d SHA-256: d0d41aa633d8904b8ae94e2d81fc2bee3e377859ca6f79c9b83688ee9aac8f8a

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is obfuscated and utilizes `eval()` and `String.fromCharCode()`. The critical heuristic firing indicates exploitation of CVE-2008-2992, a known vulnerability in Adobe Reader related to JavaScript execution. The script likely decodes and executes a malicious payload. No specific family could be identified, but the attack pattern is consistent with a PDF-based exploit delivering a secondary stage.

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` `057e4d16f8a82e95875321910a294e8db3b792c02232a6b07b296485af23c03f`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22473 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` `3e02e62de66cafeeb9acc294972a7a8f046f3bf0b27f81d2e6a9bb5b93b19aa6`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6625 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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