PDF malware analysis — malicious · d1fd328f5a97bdd2

MALICIOUS

PDF

4.3 KB

MD5: 79071b1f8a2277499a0d9690dcfa9940 SHA-1: e9b1ce70bf54a42f35e2de4c8dfbb223bb8375f3 SHA-256: d1fd328f5a97bdd22bde8fac7c05c63f021e183feb8ce6bacfda0cd062deb91a

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is obfuscated and utilizes `eval()` and `String.fromCharCode()` functions. A critical heuristic identified the CVE-2008-2992 exploit, which involves a PDF launcher concatenating info fields, extracting characters at a fixed stride, and evaluating the result. This indicates the primary function is to execute malicious JavaScript, likely to download and run a secondary payload. The deobfuscated JavaScript is also suspicious, further supporting this attack pattern.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `7d7ec9e9870fe6998cfbcd434353f144c882a4ac32a6e31c038c43d298451dbd`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22104 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` `32b38b6156196585c9265749379a76325986d31bb3049b7bd786de02b847cd30`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6500 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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