PDF malware analysis — malicious · 371dd4c4ce90bfab

MALICIOUS

PDF

4.4 KB Created: 2010-16-01 19:53:24 +03:00 Authoring application: fackoPDF 6.09 (via BCL macroPDF 5.05)

MD5: 9e296b1940f1e857c1bb9a6263399d45 SHA-1: d48987021ae93284c7a101b4d75ef38a75678dde SHA-256: 371dd4c4ce90bfab14e686527abe83aee96e93266fd3af50a3e5c1611d75342f

330 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document contains embedded JavaScript that is heavily obfuscated using quoted-hex fragments. The JavaScript exploits multiple Adobe Reader vulnerabilities, including CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). The primary function of the script is to act as a stager, downloading and executing a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.Dropper.Agent-7249060-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7249060-0
Quoted-hex fragment JavaScript stager high PDF_QUOTED_HEX_FRAGMENT_JS_STAGER

PDF JavaScript stores the hidden exploit stage as many quoted hexadecimal fragments, joins them through helper functions, and evals the recovered JavaScript. The decoder is bounded and only fires when the recovered stage contains concrete Acrobat exploit APIs or heap-spray shellcode markers.
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0015_000.js` `3db32dbc1ac2f2595e62ff97c141bc0708778e1e3049a48f0d5a886b2794eb18`	pdf-javascript-stream	PDF /JS object 15 at offset 0x317	9012 bytes
`quoted_hex_fragment_stage_000.js` `4cc42d85b94a5c38ecf7fe3abc6e6355de514edb4573b4f350abc4e980d5a33b`	deobfuscated-js	quoted-hex fragment decoded JavaScript object 15 at offset 0x3F1	3292 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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