PDF malware analysis — malicious · 528c16cf5bae176c

MALICIOUS

PDF

4.1 KB

MD5: b355083f685ed5c3a1f36b7650376849 SHA-1: 2448cb4ca42e2b0c3546744f07091a397e023d33 SHA-256: 528c16cf5bae176c72503c91221f38a772822024f15dc47698ce2cd9b54c5bce

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is executed using a known vulnerability (CVE-2008-2992). The heuristic firings indicate the use of eval() and String.fromCharCode, suggesting obfuscated JavaScript is being used to achieve its malicious objective. The primary function of the embedded script appears to be downloading and executing a secondary payload, as indicated by the 'numeric_charcode_stage_000.js' artifact.

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` `ad09b481c1a3075f1664817f02fbd37e79aa3c5928ce6d31f675f84cd0fcca42`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20134 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` `d11a1d1b3b6a0b66f725ef8b12f84bef19dc2729b4a5ad67340a487f5e1ae02f`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5938 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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