PDF malware analysis — malicious · b7e0490f16761195

MALICIOUS

PDF

4.7 KB

MD5: 1dc90af4459447fbbfc3b088eb69d73c SHA-1: 30798a0f62f94c12addd3a1ba9f8d1de52beccfe SHA-256: b7e0490f167611956c3b06941651ec375c890246b98717fee46817bc5be83aa6

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 finding 'CVE_2008_2992' suggests the exploitation of a known vulnerability to decode and execute JavaScript. The extracted JavaScript files, 'javascript_obj0005_000.js' and 'numeric_charcode_stage_000.js', are likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The exact nature of the payload is not discernible from the provided evidence.

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` `e6837a02d9dfcf568bec32a711971f328faa60e10d53501da84fc7dcd731eecc`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22886 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` `d1111cf86867f984d7e1ce3c5a6994965517c44ab822df132d87a17457a1f3fa`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6760 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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