PDF malware analysis — malicious · 72e11b975c5a30cb

MALICIOUS

PDF

130.2 KB

MD5: 6b781570d517ca50f9eb80df7f9abbdf SHA-1: 6b1f8802ca6de405f6461a45f6a19af72aea43c8 SHA-256: 72e11b975c5a30cbdab767e0dd064028c73e98e7988a6ea3d86d6297ea7dc064

170 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings and the presence of JS streams. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload. ClamAV detections further confirm the malicious nature of the file, identifying it as a PDF exploit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36114 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36114
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `6df8aa0bc56e9b9e1d3d296e2bfc0ae290cf5501f042e44fb4780bb4457210ee`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	4205 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`javascript_obj0008_001.js` `6437f84d6de88af76ec6c2463a321d61a9c72893839887f7a5e015f2a95c6e42`	pdf-javascript-stream	PDF /JS object 8 at offset 0x209	132847 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `bf526e5e8fb0a277a2aa63e41956188cbaaef88e710f55a4d56780d0d2c347fd`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x1288	416 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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