PDF malware analysis — malicious · de6b00ecac3ec6f2

MALICIOUS

PDF

45.0 KB

MD5: c6dd2ad8913743f2449b51af57d55da3 SHA-1: 70110c5781e0d38c076bd42f23783ee681c5df51 SHA-256: de6b00ecac3ec6f2f72d4253f64373bc3883bf6cf086c156d33f06c7add6e214

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: JavaScript T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566.002 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript, triggered via the 'collab.collectEmailInfo' function, which is indicative of CVE-2007-5659 exploitation. The heuristics indicate that this JavaScript acts as a stager, likely intended to download and execute a second-stage payload. The presence of U3D content also suggests a potential exploit vector. Due to the obfuscation and truncation of the full script, the exact payload and delivery mechanism cannot be definitively determined, leading to an 'unknown family' classification.

Heuristics 7

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)
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.
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `e10073c3fbee019ba92ffefe96d8f3f0cede68dfdb93e3449754adbfa9894165`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4578	471 bytes
`annotation_subject_callee_hex_stage_000.js` `89125f46516eb3d3a38aaf8a0058bd5cf9af6b03a6b4ab00f912bc03b09f5d4a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1C3A	5713 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d0fa7dd6ff74a62dc8ee29c828e540586ef0c3b11fb12e329ec10f83e92dce1c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C8E	12817 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `bec45cf5615bea51f6140dadc36244a0548ff1447660072ccbe313e78838e31c`	deobfuscated-js	PDF JavaScript deobfuscation pass	228998 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000047bb.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x47BB	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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