PDF malware analysis — malicious · 5d5c3d43dd1b2292

MALICIOUS

PDF

1.8 KB

MD5: 8b740c3d95852a23a6f8c5a2030c74b5 SHA-1: ad31d6f695c1754a4fefc18f946b5bede5b2ee77 SHA-256: 5d5c3d43dd1b2292f1ab97b996d3ac38ab65eb1465108285601df62a344fe551

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits the CVE-2009-0927 vulnerability using the Collab.getIcon method. This JavaScript is designed to download a second-stage payload from the URL http://chickfilapoplar.com/1x/l.php?i=6. The ML classifier strongly indicates maliciousness, and the combination of exploit and downloader points to a typical initial access vector for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://chickfilapoplar.com/1x/l.php?i=6

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`legacy_pdfkit_stage_000.js` `e54b084516cf3c21e05ef67e30d792fc6e80151218b2056e45125e78f5bc9ba6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2649 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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