PDF / .COM malware analysis — malicious · 5715dd5255fcd88c

MALICIOUS

PDF / .COM

45.1 KB

MD5: 536b5664b28c8ebad11605850e7eb9f7 SHA-1: 78d095648fdd82a5aaea799a3a08ac67b0da5176 SHA-256: 5715dd5255fcd88c904355f7d5cb15818173df0d629720b696b3d90d39ad63b8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript and exploits CVE-2007-5659 via the `collab.collectEmailInfo` function. The `annotation_subject_callee_hex_stage_000.js` script appears to be a deobfuscated stager responsible for downloading and executing a secondary payload. The presence of U3D content also indicates a potential exploit vector. The exact download URL and final payload could not be determined due to the obfuscation and truncation of the script.

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `ba166ba339dfad11a60ec0a4cfc84970f4749dbf3d24fbdcc597fb4e53d521f8`	pdf-javascript-stream	PDF /JS object 9 at offset 0x45D0	492 bytes
`annotation_subject_callee_hex_stage_000.js` `5cb5b3ac147716214cc97e972884f8e33fd91e7d6d54d03b27a3dac9af01a6b1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1C7C	5764 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `280ac27e4852f52653a287a5217ee14db2721dfacad568af7398e06c78c4c7e6`	deobfuscated-js	PDF JavaScript deobfuscation pass	227983 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004818.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4818	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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