PDF malware analysis — malicious · 60f991b4179b3376

MALICIOUS

PDF

7.8 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: b66cace727195d815bcdca7c8660a066 SHA-1: 8d46ce5c0575ce232459f7912826b69c0f79be69 SHA-256: 60f991b4179b33762a9f1c656986e162438ebfd0a0e97a1a037c9039cbcc75f0

378 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains multiple JavaScript exploits targeting CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The embedded JavaScript is obfuscated but ultimately attempts to download and execute a second-stage payload from the URLs http://state-pa.net/e/load.php?spl=pdf_pack and http://state-pa.net/e/load.php?spl=pdf_new. The use of eval() and String.fromCharCode() in the JavaScript confirms its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 11

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)
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)
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded 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://state-pa.net/e/load.php?spl=pdf_pack
- http://state-pa.net/e/load.php?spl=pdf_new

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0014_000.js` `e1b5fb5d613d143a0e079d601868f7d91e74f8c2355e428f0870daddab468681`	pdf-javascript-stream	PDF /JS object 14 at offset 0x1721	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0015_001.js` `1ec06a2e039b727447192a8f866769252618d0ff810b2bdc7e737c9ecd9f5a05`	pdf-javascript-stream	PDF /JS object 15 at offset 0x183C	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0016_002.js` `a8f96d2b44ed171f98666f354b3f2194f9a31d7dcb30dcb86210903859bcea23`	pdf-javascript-stream	PDF /JS object 16 at offset 0x1956	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0017_003.js` `273dfb3fc3798738ba1829ddce3525d88e8ea5143a13abb5a439ecd95f437c60`	pdf-javascript-stream	PDF /JS object 17 at offset 0x1A6B	315 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0018_004.js` `d6ee2f9b0caaf1f675dd23e31b1edb0ceb9ed403ee07a5f39c67e16bd0450417`	pdf-javascript-stream	PDF /JS object 18 at offset 0x1B86	306 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c228d3c78b8c8da2bb4d0fa617edd311b5116377305a2de7e1d46980b9fa7a0d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1D2	2938 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f971e795dce0571b4538993a6d9de80061ba1c2fa03acb82431345411e3a4f53`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x95E	1634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `9d2674b9fefb02e4cf381ff8d3b12518de82b4d208f8f5cbcfafae36b793e9d4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xFCC	1800 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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