PDF malware analysis — malicious · 087e421f5f11cb2f

MALICIOUS

PDF

3.5 KB

MD5: 5e79f184f26c771a68c269c7d1a39441 SHA-1: 6902e90beaca36ab9c236f6d499250580f0f331b SHA-256: 087e421f5f11cb2f0197b27bed06dc69f852d2f485e1f32922d515076034de8c

376 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains JavaScript that leverages CVE-2008-2992 and CVE-2009-1492 vulnerabilities. The embedded JavaScript attempts to download a second-stage payload from the URL http://12.68.100.51/calc.exe, indicating a dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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.
getAnnots — CVE-2009-1492 high CVE exact CVE_2009_1492

PDF JavaScript calls getAnnots() with an exploit-shaped argument (integer-overflow numeric or long string) — CVE-2009-1492 affects Adobe Reader's annotation handling and allows memory corruption. (identified after static deobfuscation)
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: Pdf.Dropper.Agent-7346291-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7346291-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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).
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs.
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://12.68.100.51/calc.exe

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `65e6cc05a19eb53c2156c3d9f65721f01f3c6472dfb42e9210850a28d9f6f257`	pdf-javascript-stream	PDF /JS object 7 at offset 0x280	120 bytes
`combined_document_js_000.js` `3f5921731e53a7d4913944f3e33021de29401d4c8168f14ff933afb6bb59f65f`	deobfuscated-js	combined document JavaScript streams at offset 0x280	143 bytes
`deobfuscated.js` `a559a1e8f7b174eb8578678dbcb1d362961b72f87f7203fb45cef43332a1285c`	deobfuscated-js	PDF JavaScript deobfuscation pass	1785 bytes

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