PDF malware analysis — malicious · ea8347a91c44da66

MALICIOUS

PDF

4.4 KB

MD5: 88f7c0348a0a6d13d560850618378a04 SHA-1: d04839939e491cea290bf7ee4fd0ff5ab7218cfb SHA-256: ea8347a91c44da6613cdc216f57d795cd333692b93b7c9f193495153df94ba02

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2008_2992 firing suggests the exploitation of a known vulnerability within PDF readers. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload. The deobfuscated JavaScript file, numeric_charcode_stage_000.js, was also extracted.

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` `460dc7692a9c98a703c50544a8532fd54945ca8b9f41e5f24e565fbd633c75bb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23786 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` `1a24d2f75b95957be87fe169e785d22918525714d27ebfe7bac7bdfa0cdcedb0`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6982 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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