PDF malware analysis — malicious · febf3076ce21d792

MALICIOUS

PDF

44.6 KB

MD5: c10864160ab673d20fd9bac6767f5083 SHA-1: 3e2088a17ae6b2c13e4d007217f019569bd4f1ce SHA-256: febf3076ce21d792acccbc8d3728cf61dfac142de6005c9551bf0d52b1bd17c3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to 'collab.collectEmailInfo'. This JavaScript acts as a stager, indicated by the 'annotation_subject_callee_hex_stage_000.js' and 'deobfuscated.js' artifacts, which are likely responsible for downloading and executing a secondary payload. The presence of U3D content also suggests an exploit attempt.

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` `795764f2f24cd6e151be2c66ff2ec93437966e9bc41fccc1ca87acf4c2298a5e`	pdf-javascript-stream	PDF /JS object 9 at offset 0x43ED	498 bytes
`annotation_subject_callee_hex_stage_000.js` `32a0b490cce619af285148f87fbffd2d2f6d404f84181c550097f69cc7adb731`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B19	5483 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` `34ca302fcce827c8a811a6c5ce8038527394dc4a21b2ad4804bd6832d09b2a6a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B6D	12324 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` `1eba0ed0b570f2d1d464ad950e7e912fe07221c39505e62303853b4b5c153103`	deobfuscated-js	PDF JavaScript deobfuscation pass	231539 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004623.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4623	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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