PDF malware analysis — malicious · 85935c01a45dd445

MALICIOUS

PDF

2.6 KB

MD5: 7d6d0808fc387190368441798702f94b SHA-1: d5e691f4af2398ffea71e57c5b61773878c8052e SHA-256: 85935c01a45dd44543fd49c1844067caf44693e56c9f370d6c6134a2cf6b3060

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample contains obfuscated JavaScript that utilizes `unescape` and memory manipulation techniques. The script attempts to exploit CVE-2009-4324 via the `media.newPlayer` object, indicating it's designed to execute arbitrary code. The reconstructed string from the script is: %u016a%u3c6b%u0b24%u0360%u240c%u116a%u0c03%u6a24%u6804%u7064%u2d36%u295f%u0339%u240c%u7130%u2d36. This exploit is a common method for delivering secondary payloads.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Win.Exploit.Avoid_Utf8_Tolower_JS-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Exploit.Avoid_Utf8_Tolower_JS-1
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `36ec06f1230f1eb6a5f0ba9880cf5deb3fa67060b6e170c22b7d2003178b5cad`	pdf-javascript-stream	PDF /JS object 6 at offset 0x191	1575 bytes
Detection ClamAV: Win.Exploit.Avoid_Utf8_Tolower_JS-1 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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