PDF malware analysis — malicious · d63530ab3671d6d5

MALICIOUS

PDF

37.1 KB

MD5: 631e3aac9cfeebef37c047ebb08184d0 SHA-1: fcf1e905cfb2521d5834dc31acd6e016aa526641 SHA-256: d63530ab3671d6d5cdae689e0c04e800afee854d1f94c6cf8d057e8e3a296b9c

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF file contains multiple heuristics indicating JavaScript execution and exploitation of CVE-2007-5659, related to the Collab.collectEmailInfo function. The critical heuristic PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER specifically points to a JavaScript stager within an annotation subject. This stager is responsible for decoding and evaluating obfuscated JavaScript, which likely downloads and executes a second-stage payload. The presence of U3D content also suggests a potential exploit vector.

Heuristics 8

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.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	264 bytes
`annotation_subject_callee_hex_stage_000.js` `0b5dd10a7d5e24f02cf553c306d09ae93c5cd7e33d7022ebcc640ee03948cc32`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `dd4a5de35b24accf40a2c7ab7c296dc07836ab9ef2db9a7a463a8fd1f500a3b3`	deobfuscated-js	PDF JavaScript deobfuscation pass	275630 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00002820.bin` `cffa1d7a24d7b9b42a43d7048cdc78d60069fa1b4ff10ec2aa0d89c3ba9ba702`	pdf-3d-stream	PDF U3D 3D stream at offset 0x2820	27384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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