PDF malware analysis — malicious · 028b54682bbc8ee3

MALICIOUS

PDF

3.3 KB

MD5: e8e09e93f429adb5fba02cc50034a0f9 SHA-1: 05dd13bed321716b68c62dddf44161be995038b7 SHA-256: 028b54682bbc8ee364a117b1a609ca87d3bcfb30e4372cfdd589427194698cf9

278 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2008-2992, a known vulnerability in Adobe Reader. The script is designed to download and execute a payload from the URL http://12.68.100.51/calc.exe. The presence of exploit indicators and the embedded download URL strongly suggest a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 10

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)
ClamAV: Pdf.Exploit.Pdfka-6295461-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Pdfka-6295461-0
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.
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://12.68.100.51/calc.exe

Extracted artifacts 4

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
`generic_stage_recovery_000.js` `b08f3caa41c82912d53fed9501bad8ceb1d384f7f3749256ebd1857c0f331434`	deobfuscated-js	generic stage recovery js-unescape-u-words -> null-collapse from decompressed stream at 0x499 at offset 0x499	1918 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`combined_document_js_000.js` `3f5921731e53a7d4913944f3e33021de29401d4c8168f14ff933afb6bb59f65f`	deobfuscated-js	combined document JavaScript streams at offset 0x280	143 bytes
`deobfuscated.js` `f49ef629100db9f004ef629202b18ff7942ce34eb5f89914f20c482e72e85570`	deobfuscated-js	PDF JavaScript deobfuscation pass	11892 bytes

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