PDF malware analysis — malicious · 7b98a09d3628e171

MALICIOUS

PDF

1.37 MB

MD5: ab46c2626fdb3016b6949997a5c13c5b SHA-1: 1e96d53d749286bbfaec870b126632642fde20be SHA-256: 7b98a09d3628e171c764adffec407b5bedda9c377a6249bc541825e4188b3a42

632 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF that leverages multiple known Adobe Reader vulnerabilities through embedded JavaScript. The script constructs URLs and attempts to download a second-stage payload, as indicated by the 'PDF_JS_SHELLCODE_DOWNLOAD_URL' heuristic. The embedded JavaScript is obfuscated but appears to be designed to exploit these CVEs to achieve code execution and download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 15

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)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
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).
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://mobisexonline.com/new/post.php?e=6&&
- http://mobisexonline.com/new/post.php?e=5&&
- http://mobisexonline.com/new/post.php?e=7&&
- http://mobisexonline.com/new/post.php?e=8&&

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `657ec08f5cf38137b2fc3220a8f12a2dc2d26a2792bd0dec7d18d531770f6b7f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1512 bytes
`javascript_obj0004_001.js` `4c0758bc6797d832627b3156b2c03bf58ea521124c7fa93e428969fd2af3fc16`	pdf-javascript-stream	PDF /JS object 4 at offset 0x209	524288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `d8f40c6c4e1baca5c3eaf545b16ed695eddef38c348702900e4231c1b804cf38`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x803	4597 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`javascript_obj0008_000_1.js` `fa1079d2fd3ff89707e15310ecaf2d9a22d6629b8dc5f896db6b1111bd709569`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1629 bytes
`javascript_obj0004_001_1.js` `8f2436556d88934465252da52d1d39cacffea8c09d2c351b46d8a368e09a727d`	pdf-javascript-stream	PDF /JS object 4 at offset 0x209	524288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000_1.js` `daae90e2942a4b3134ed63c80561dbbf40944f38c696d9d6efcde48617f8f3d5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x878	1269 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes
`polyglot_child_pdf_off00011680.pdf` `8f77898ba599f5fbc27eb9adf822830388aab5aa37260bc0fbfca997111b4ce7`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x11680	1370322 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`polyglot_child_pdf_off00016a75.pdf` `17fa1c42733292aa5596d98ca57831cedbf0285998b510e9bbd4c79f0f51750e`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x16A75	1348829 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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