PDF malware analysis — malicious · 70543cd4337ab9aa

MALICIOUS

PDF

45.5 KB

MD5: ab52422821b061a4a244e400b5e0fe1c SHA-1: 3a955f3866ba26ed52afe5e25597b9572210362d SHA-256: 70543cd4337ab9aa1cc52c6c748774cd800b8ecd47545577a613254214aa7b31

398 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages multiple critical vulnerabilities in Adobe Reader, specifically CVE-2009-3459 and CVE-2007-5659, to execute embedded JavaScript. This JavaScript is designed to download and execute a second-stage payload from the URL http://dasafa.info/page/new.php/n002106203r0011X2be3037bY67d49fceZ0100f060. The use of known exploits and a clear download URL indicates a high likelihood of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 12

Adobe Reader U3D auto-activated 3D annotation — CVE-2009-3459 critical CVE likely CVE_2009_3459_U3D_AUTOACTIVATE

PDF contains a /Subtype /3D annotation that is configured to auto-activate on page view (/3DA <</A /PV /AIS /I>>) alongside a /U3D stream and JavaScript. This is the document shape used by CVE-2009-3459 (Adobe Reader U3D CLODProgressiveMeshDeclaration heap overflow, APSB09-15): the U3D parser runs without any user interaction once the page is rendered, while the accompanying JavaScript prepares a heap-spray to land controlled memory inside the corrupted allocation.
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)
Adobe Reader U3D CLODProgressiveMeshDeclaration exploit critical CVE likely CVE_2009_3953

PDF combines malformed U3D 3D content with JavaScript/action activation. CVE-2009-3953 is an Adobe Reader/Acrobat U3D CLODProgressiveMeshDeclaration array-boundary vulnerability triggered by malformed U3D data in a PDF.
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Adobe Reader APSB09-15 patch-range version gate (CVE-2009-3459) high CVE likely PDF_JS_ADOBE_APSB09_15_PATCH_GATE

PDF JavaScript gates the exploit payload on an Adobe Reader version range that exactly matches the APSB09-15 patch boundary (< 9.2, < 8.1.7, < 7.1.4). That boundary fingerprints the CVE-2009-2990 / CVE-2009-3459 U3D parser vulnerabilities — no benign script tests all three Reader version-points together.
Adobe Reader APSB08-13 patch-range version gate (CVE-2007-5659) high CVE likely PDF_JS_ADOBE_APSB08_13_PATCH_GATE

PDF JavaScript gates the exploit payload on (>= 8 && < 8.1.1) OR (< 7.1) — the Reader 7.0.x / 8.0–8.1.1 window patched by Adobe APSB08-13 for the CVE-2007-5659 Collab.collectEmailInfo buffer overflow. Only kits that target that exact bug check both of those patch points; benign scripts do not.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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://dasafa.info/page/new.php/n002106203r0011X2be3037bY67d49fceZ0100f060

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `13e428efbba6d9f497c253ef53ac3f08561c5f9f3f489b4e0fd8def3952ba1fd`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4777	539 bytes
`legacy_pdfkit_stage_000.js` `576f4d6ec9337b8a92d8c725fefdfb618a9485ba1590a9f4dc82dab7372d1669`	deobfuscated-js	z-percent UTF-16BE base-21 decoded JavaScript at offset 0x1C6A	5649 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `4a6f1daaf79caecb9c68740b92c2f0ab46b8ac97ed20e9c94eb903ce9ef43990`	deobfuscated-js	PDF JavaScript deobfuscation pass	254773 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000049d9.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x49D9	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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