PDF malware analysis — malicious · 4d6e5de15caea893

MALICIOUS

PDF

67.2 KB Created: 2012-10-02 16:53:23 +04:00 Authoring application: hlasqkw (via twtslsv)

MD5: f4af04fc7329696b3b7ad58a56a115bc SHA-1: 597cf874a88b64f6568d3f6f31dcda4f07eee1ad SHA-256: 4d6e5de15caea89325a5e42adf3d26b2fc3a1c76362209f3989dfeb7029eff61

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document exploits CVE-2007-5659 by leveraging an AcroForm marker-unescape JavaScript stager. The stager is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript actions and embedded JS streams further supports this. The specific exploit used is identified as Collab.collectEmailInfo.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 8

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)
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` `4bb114708041123de77bdfe2774348c826d722d15de2e7baa1bb42bb4e5c9337`	deobfuscated-js	AcroForm field Text3 marker-unescape JavaScript at offset 0x43A	3726 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0106_000.js` `2a137cd74ec5f7ae40e3ae5737d43a1572bfb22c7dced9e3e03b0bd73c16a51b`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10B25	212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0106_001.js` `0d3b41d2a93ffc677f1458f4035cab8543294cc3cf518638db345073003e7c8f`	pdf-javascript-stream	PDF /JS object 106 at offset 0x10B49	387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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