PDF malware analysis — malicious · a1b8fd5d236ff292

MALICIOUS

PDF

4.0 KB

MD5: 12959f97000f6910032224eae14636d3 SHA-1: 7ba03ceaca1b467b64b97a2d8e4894768300fcbf SHA-256: a1b8fd5d236ff292f63e3796393fd833be8915b0d2f88f74aa5c7212725378d7

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the presence of a custom Base64 decoder and an Adobe Reader exploit stage. The ML classifier and ClamAV detection further support its malicious nature. The primary attack vector appears to be exploiting CVE-2008-2992 via JavaScript within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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)
ClamAV: Pdf.Dropper.Agent-7288596-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7288596-0
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `4326e55f8f11e407bfedcf5095be8d2cd80477e05020fab295f8f7d1eb29c334`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6393 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `133b9abb41ffab0f29b6711a503482387d89b47838786d1f7f757c00682c09db`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3641 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`custom_b64_stage_000.js` `85fe71200c33f398824631ccde606ec4fbbce8035fb8611c145accabab2137e1`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.