PDF malware analysis — malicious · 887fc20706efd9f4

MALICIOUS

PDF

1.95 MB Created: 2008-08-02 11:25:13 +04:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0 (Windows))

MD5: dc9c8fff121a84e2a6c2e715a073f961 SHA-1: f78699f40fa2c360f6ea0ca9471faa37476db897 SHA-256: 887fc20706efd9f4825e99a74b6b273b03fa504ad135511c5355d9b93a3909ee

372 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to achieve code execution. The JavaScript is heavily obfuscated and appears to be a dropper, as indicated by ClamAV detections of 'Pdf.Dropper.Agent-7279725-0' and 'Js.Exploit.Shellcode-18'. The primary attack vector is likely spearphishing attachment, leading to the execution of a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 11

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. (matched in decompressed stream)
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-7279725-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7279725-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0016_000.js` `a57b424ce100da4aa84ee81f8350f9368c263ade7ac2d448f11e0ca1c028ff4a`	pdf-javascript-stream	PDF /JS object 16 at offset 0x43D	5110 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`javascript_obj0025_001.js` `b5ba09264c453e6ea26221c74b8d20dbda7e6d374cf193467b0164fbf0f558e4`	pdf-javascript-stream	PDF /JS object 25 at offset 0x230D	5098 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `6db5de115d2e11380a7ed717b591990ea2f68ba60a6e6f16b468930bb58072a6`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 16 at offset 0x43D	4585 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `bfa3337276d70f027e50f87d2bfec33d1a0eeb0fbe7435500776cc1a02485e58`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 25 at offset 0x230D	4573 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `d8932503576a3a349dc00193b33a2798354179078fa07fa4e2987942e268e666`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x43D	9159 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 32 eval/decoder/string-building token(s).
`combined_document_js_000.js` `36782c5b1cf458d133a89e41676666c7241e5fc76a5a6bc37cebb5fd765c8b45`	deobfuscated-js	combined document JavaScript streams at offset 0x43D	10209 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 32 eval/decoder/string-building token(s).

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