PDF malware analysis — malicious · 72cdebfa00fbf8fa

MALICIOUS

PDF

66.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: uqggxko (via trnioci)

MD5: c3ac6df4e9f448be750f71645adb396f SHA-1: 3725c352ef176844131600ae7fbc541268fb70a9 SHA-256: 72cdebfa00fbf8fa134dfe3bd871f1d9ba4bd8c6d15781b12026a0cbebc68339

252 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages the AcroForm marker-unescape stager to exploit CVE-2007-5659 in Adobe Reader. The JavaScript code, after deobfuscation, uses unescape() to decode a payload which is then executed. This indicates a client-side exploit designed to download and run a secondary malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 9

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)
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
AcroForm marker-unescape JavaScript stager high PDF_ACROFORM_MARKER_UNESCAPE_JS_STAGER

PDF OpenAction JavaScript reads an AcroForm field value, rewrites a long marker token back to percent escapes, then unescape/eval executes the recovered exploit stage.
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.
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://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`acroform_marker_stage_000.js` `150cd945189bb83f19d8762bc2950041fc1a45145bc5f16aa554b2e08ea2dcf2`	deobfuscated-js	AcroForm field Text3 marker-unescape JavaScript at offset 0x43A	3666 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0106_000.js` `da2932c246ba8ff995d374c047f9702b34e7bf3bb4560a64e5bf0cfd61786d0b`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10728	210 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0106_001.js` `30a4c7292c95f10706db1b4478f83e1e43ed42b15280474300a5305369bf8bdd`	pdf-javascript-stream	PDF /JS object 106 at offset 0x1074C	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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