PDF malware analysis — malicious · dcabce2987e94921

MALICIOUS

PDF

737.1 KB Created: 2009-03-05 21:22:26 +08:00 Authoring application: Acrobat Web Capture 8.0

MD5: cb2094b33e57eafd5634fbaf325c0966 SHA-1: 964edadfcc1de233cfa17e00791fa8ad83349b8f SHA-256: dcabce2987e949212d59d0ac72727a8895cb84edfcb39d4cdbbf919fce430743

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes a heap spray technique, specifically targeting the CVE-2009-0658 vulnerability in Adobe Reader. The presence of multiple obfuscated JavaScript streams and the ML classifier's high confidence score indicate malicious intent. The primary goal appears to be the execution of arbitrary code via the exploit, likely leading to the download and execution of further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 9

Adobe Reader JBIG2Decode heap-spray exploit critical CVE likely CVE_2009_0658

PDF combines JBIG2Decode image streams with a Reader 9 JavaScript heap-spray stage. This is the in-the-wild Adobe Reader/Acrobat JBIG2Decode exploit shape associated with CVE-2009-0658.
JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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/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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0054_000.js` `76b9a9d595e071c01fab427db3229805067700ca8167c99a8d39a6f6869c3734`	pdf-javascript-stream	PDF /JS object 54 at offset 0x9495	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0056_001.js` `a286a724917c4ed12e23c56fdbe9b05a086df706402e840df93ca822a639bf8f`	pdf-javascript-stream	PDF /JS object 56 at offset 0xA650	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0058_002.js` `6300b36f22ef6578b0f03e4e9331a4dc1cfa3ef51cfced50c1ce2d725dd82351`	pdf-javascript-stream	PDF /JS object 58 at offset 0xB7B5	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0060_003.js` `9fdeb4cf92d3ba004fe834e1ec15e7554d02b14121596b2b2948628aa9003bc4`	pdf-javascript-stream	PDF /JS object 60 at offset 0xC848	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0062_004.js` `0a9d23151e9073a8ce6d92ab297ef25ffa9a4997c3ef7ce0ab8072f24b3d913b`	pdf-javascript-stream	PDF /JS object 62 at offset 0xD8DB	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0064_005.js` `eda1a66b85446d51354818baf9e701cdc2d3426a71f8bb35fcb677bb522646b5`	pdf-javascript-stream	PDF /JS object 64 at offset 0xE96D	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0066_006.js` `81adc8bd7014daa6355cf20ea01b14f79bca4b4c76f8c2fd674fb8103622f478`	pdf-javascript-stream	PDF /JS object 66 at offset 0xFA00	1845 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0068_007.js` `458e954f8b259080881683abc6ca3cff365a406c2deb959633a401931e84049c`	pdf-javascript-stream	PDF /JS object 68 at offset 0x10AD8	1824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_009_off00001c1f.bin` `6a71966cad617bfb05c2fc57e09517130f7abf80fb7d2cd8d6f9a72dd0ff8cc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C1F	8958 bytes
`jbig2_00_off00008305.bin` `c43826ce1f6fa18c04d61f69700e09df49f6dee964c0b0d2696925bfbfe74617`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x8305	3739 bytes

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