PDF malware analysis — malicious · fe01dcd8d1de4c98

MALICIOUS

PDF

4.1 KB

MD5: bdc09c8e1940c249f86a5052c96ec7f6 SHA-1: 64dee10db1ce3ec0cfbce38a68cc7220341eed5d SHA-256: fe01dcd8d1de4c98315c0804c9017dbdacfea99a13446ac1076b12270150f8b3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known PDF vulnerability via util.printf. The embedded JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise.

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` `183bb53749c96229c26cb10154388fab96b62abe5b405a0759b3c907536a717f`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20650 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` `3dbf0720229088c43b94b139a308c054f7bb82906131b801264f7e701b9b3453`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6078 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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